In bed 9 hours (the younger 10) In school, at their studies and tasks 9 "
In school, or in the house, the elder at optional studies or work, the younger at play 3 " (the younger 2) At meals 1 "
Exercise in the open air, in the shape of a formal walk, often with lesson-books in hand, and even this only when the weather is fine at the appointed time. 1 "
---- 24
And what are the results of this "astounding regimen," as Sir John Forbes terms it? Of course feebleness, pallor, want of spirits, general ill-health. But he describes something more. This utter disregard of physical welfare, out of extreme anxiety to cultivate the mind--this prolonged exercise of brain and deficient exercise of limbs,--he found to be habitually followed, not only by disordered functions but by malformation. He says:--"We lately visited, in a large town, a boarding-school containing forty girls; and we learnt, on close and accurate inquiry, that there was _not one_ of the girl who had been at the school two years (and the majority had been as long) that was not more or less _crooked_!"[8]
It may be that since 1833, when this was written, some improvement has taken place. We hope it has. But that the system is still common--nay, that it is in some cases carried to a greater extreme than ever; we can personally testify. We recently went over a training-college for young men: one of those inst.i.tuted of late years for the purpose of supplying schools with well-disciplined teachers. Here, under official supervision, where something better than the judgment of private school-mistresses might have been looked for, we found the daily routine to be as follows:--
At 6 o"clock the students are called, " 7 to 8 studies, " 8 to 9 scripture-reading, prayers, and breakfast, " 9 to 12 studies, " 12 to 1 leisure, nominally devoted to walking or other exercise, but often spent in study, " 1 to 2 dinner, the meal commonly occupying twenty minutes, " 2 to 5 studies, " 5 to 6 tea and relaxation, " 6 to 8 studies, " 8 to 9 private studies in preparing lessons for the next day, " 10 to bed.
Thus, out of the twenty-four hours, eight are devoted to sleep; four and a quarter are occupied in dressing, prayers, meals, and the brief periods of rest accompanying them; ten and a half are given to study; and one and a quarter to exercise, which is optional and often avoided.
Not only, however, are the ten-and-a-half hours of recognised study frequently increased to eleven-and-a-half by devoting to books the time set apart for exercise; but some of the students get up at four o"clock in the morning to prepare their lessons; and are actually encouraged by their teachers to do this! The course to be pa.s.sed through in a given time is so extensive, and the teachers, whose credit is at stake in getting their pupils well through the examinations, are so urgent, that pupils are not uncommonly induced to spend twelve and thirteen hours a day in mental labour!
It needs no prophet to see that the bodily injury inflicted must be great. As we were told by one of the inmates, those who arrive with fresh complexions quickly become blanched. Illness is frequent: there are always some on the sick-list. Failure of appet.i.te and indigestion are very common. Diarrhoea is a prevalent disorder: not uncommonly a third of the whole number of students suffering under it at the same time. Headache is generally complained of; and by some is borne almost daily for months. While a certain percentage break down entirely and go away.
That this should be the regimen of what is in some sort a model inst.i.tution, established and superintended by the embodied enlightenment of the age, is a startling fact. That the severe examinations, joined with the short period a.s.signed for preparation, should compel recourse to a system which inevitably undermines the health of all who pa.s.s through it, is proof, if not of cruelty, then of woeful ignorance.
The case is no doubt in a great degree exceptional--perhaps to be paralleled only in other inst.i.tutions of the same cla.s.s. But that cases so extreme should exist at all, goes far to show that the minds of the rising generation are greatly over-tasked. Expressing as they do the ideas of the educated community, the requirements of these training colleges, even in the absence of other evidence, would imply a prevailing tendency to an unduly urgent system of culture.
It seems strange that there should be so little consciousness of the dangers of over-education during youth, when there is so general a consciousness of the dangers of over-education during childhood. Most parents are partially aware of the evil consequences that follow infant-precocity. In every society may be heard reprobation of those who too early stimulate the minds of their little ones. And the dread of this early stimulation is great in proportion as there is adequate knowledge of the effects: witness the implied opinion of one of our most distinguished professors of physiology, who told us that he did not intend his little boy to learn any lessons until he was eight years old.
But while to all it is a familiar truth that a forced development of intelligence in childhood, entails either physical feebleness, or ultimate stupidity, or early death; it appears not to be perceived that throughout youth the same truth holds. Yet it unquestionably does so.
There is a given order in which, and a given rate at which, the faculties unfold. If the course of education conforms itself to that order and rate, well. If not--if the higher faculties are early taxed by presenting an order of knowledge more complex and abstract than can be readily a.s.similated; or if, by excess of culture, the intellect in general is developed to a degree beyond that which is natural to its age; the abnormal advantage gained will inevitably be accompanied by some equivalent, or more than equivalent, evil.
For Nature is a strict accountant; and if you demand of her in one direction more than she is prepared to lay out, she balances the account by making a deduction elsewhere. If you will let her follow her own course, taking care to supply, in right quant.i.ties and kinds, the raw materials of bodily and mental growth required at each age, she will eventually produce an individual more or less evenly developed. If, however, you insist on premature or undue growth of any one part, she will, with more or less protest, concede the point; but that she may do your extra work, she must leave some of her more important work undone.
Let it never be forgotten that the amount of vital energy which the body at any moment possesses, is limited; and that, being limited, it is impossible to get from it more than a fixed quant.i.ty of results. In a child or youth the demands upon this vital energy are various and urgent. As before pointed out, the waste consequent on the day"s bodily exercise has to be met; the wear of brain entailed by the day"s study has to be made good; a certain additional growth of body has to be provided for; and also a certain additional growth of brain: to which must be added the amount of energy absorbed in digesting the large quant.i.ty of food required for meeting these many demands. Now, that to divert an excess of energy into any one of these channels is to abstract it from the others, is both manifest _a priori_, and proved _a posteriori_, by the experience of every one. Every one knows, for instance, that the digestion of a heavy meal makes such a demand on the system as to produce la.s.situde of mind and body, frequently ending in sleep. Every one knows, too, that excess of bodily exercise diminishes the power of thought--that the temporary prostration following any sudden exertion, or the fatigue produced by a thirty miles" walk, is accompanied by a disinclination to mental effort; that, after a month"s pedestrian tour, the mental inertia is such that some days are required to overcome it; and that in peasants who spend their lives in muscular labour the activity of mind is very small. Again, it is a familiar truth that during those fits of rapid growth which sometimes occur in childhood, the great abstraction of energy is shown in an attendant prostration, bodily and mental. Once more, the facts that violent muscular exertion after eating, will stop digestion; and that children who are early put to hard labour become stunted; similarly exhibit the antagonism--similarly imply that excess of activity in one direction involves deficiency of it in other directions. Now, the law which is thus manifest in extreme cases, holds in all cases. These injurious abstractions of energy as certainly take place when the undue demands are slight and constant, as when they are great and sudden. Hence, if during youth the expenditure in mental labour exceeds that which Nature has provided for; the expenditure for other purposes falls below what it should have been; and evils of one kind or other are inevitably entailed. Let us briefly consider these evils.
Supposing the over-activity of brain to exceed the normal activity only in a moderate degree, there will be nothing more than some slight reaction on the development of the body: the stature falling a little below that which it would else have reached; or the bulk being less than it would have been; or the quality of tissue not being so good. One or more of these effects must necessarily occur. The extra quant.i.ty of blood supplied to the brain during mental exertion, and during the subsequent period in which the waste of cerebral substance is being made good, is blood that would else have been circulating through the limbs and viscera; and the growth or repair for which that blood would have supplied materials, is lost. The physical reaction being certain, the question is, whether the gain resulting from the extra culture is equivalent to the loss?--whether defect of bodily growth, or the want of that structural perfection which gives vigour and endurance, is compensated by the additional knowledge acquired?
When the excess of mental exertion is greater, there follow results far more serious; telling not only against bodily perfection, but against the perfection of the brain itself. It is a physiological law, first pointed out by M. Isidore St. Hilaire, and to which attention has been drawn by Mr. Lewes in his essay on "Dwarfs and Giants," that there is an antagonism between _growth_ and _development_. By growth, as used in this ant.i.thetical sense, is to be understood _increase of size_; by development, _increase of structure_. And the law is, that great activity in either of these processes involves r.e.t.a.r.dation or arrest of the other. A familiar example is furnished by the cases of the caterpillar and the chrysalis. In the caterpillar there is extremely rapid augmentation of bulk; but the structure is scarcely at all more complex when the caterpillar is full-grown than when it is small. In the chrysalis the bulk does not increase; on the contrary, weight is lost during this stage of the creature"s life; but the elaboration of a more complex structure goes on with great activity. The antagonism, here so clear, is less traceable in higher creatures, because the two processes are carried on together. But we see it pretty well ill.u.s.trated among ourselves when we contrast the s.e.xes. A girl develops in body and mind rapidly, and ceases to grow comparatively early. A boy"s bodily and mental development is slower, and his growth greater. At the age when the one is mature, finished, and having all faculties in full play, the other, whose vital energies have been more directed towards increase of size, is relatively incomplete in structure; and shows it in a comparative awkwardness, bodily and mental. Now this law is true of each separate part of the organism, as well as of the whole. The abnormally rapid advance of any organ in respect of structure, involves premature arrest of its growth; and this happens with the organ of the mind as certainly as with any other organ. The brain, which during early years is relatively large in ma.s.s but imperfect in structure, will, if required to perform its functions with undue activity, undergo a structural advance greater than is appropriate to its age; but the ultimate effect will be a falling short of the size and power that would else have been attained. And this is a part-cause--probably the chief cause--why precocious children, and youths who up to a certain time were carrying all before them, so often stop short and disappoint the high hopes of their parents.
But these results of over-education, disastrous as they are, are perhaps less disastrous than the effects produced on the health--the undermined const.i.tution, the enfeebled energies, the morbid feelings. Recent discoveries in physiology have shown how immense is the influence of the brain over the functions of the body. Digestion, circulation, and through these all other organic processes, are profoundly affected by cerebral excitement. Whoever has seen repeated, as we have, the experiment first performed by Weber, showing the consequence of irritating the _vagus_ nerve, which connects the brain with the viscera--whoever has seen the action of the heart suddenly arrested by irritating this nerve; slowly recommencing when the irritation is suspended; and again arrested the moment it is renewed; will have a vivid conception of the depressing influence which an over-wrought brain exercises on the body. The effects thus physiologically explained, are indeed exemplified in ordinary experience. There is no one but has felt the palpitation accompanying hope, fear, anger, joy--no one but has observed how laboured becomes the action of the heart when these feelings are violent. And though there are many who have never suffered that extreme emotional excitement which is followed by arrest of the heart"s action and fainting; yet every one knows these to be cause and effect. It is a familiar fact, too, that disturbance of the stomach results from mental excitement exceeding a certain intensity. Loss of appet.i.te is a common consequence alike of very pleasurable and very painful states of mind. When the event producing a pleasurable or painful state of mind occurs shortly after a meal, it not unfrequently happens either that the stomach rejects what has been eaten, or digests it with great difficulty and under protest. And as every one who taxes his brain much can testify, even purely intellectual action will, when excessive, produce a.n.a.logous effects. Now the relation between brain and body which is so manifest in these extreme cases, holds equally in ordinary, less-marked cases. Just as these violent but temporary cerebral excitements produce violent but temporary disturbances of the viscera; so do the less violent but chronic cerebral excitements produce less violent but chronic visceral disturbances. This is not simply an inference:--it is a truth to which every medical man can bear witness; and it is one to which a long and sad experience enables us to give personal testimony. Various degrees and forms of bodily derangement, often taking years of enforced idleness to set partially right, result from this prolonged over-exertion of mind. Sometimes the heart is chiefly affected: habitual palpitations; a pulse much enfeebled; and very generally a diminution in the number of beats from seventy-two to sixty, or even fewer. Sometimes the conspicuous disorder is of the stomach: a dyspepsia which makes life a burden, and is amenable to no remedy but time. In many cases both heart and stomach are implicated.
Mostly the sleep is short and broken. And very generally there is more or less mental depression.
Consider, then, how great must be the damage inflicted by undue mental excitement on children and youths. More or less of this const.i.tutional disturbance will inevitably follow an exertion of brain beyond the normal amount; and when not so excessive as to produce absolute illness, is sure to entail a slowly acc.u.mulating degeneracy of _physique_. With a small and fastidious appet.i.te, an imperfect digestion, and an enfeebled circulation, how can the developing body flourish? The due performance of every vital process depends on an adequate supply of good blood.
Without enough good blood, no gland can secrete properly, no viscus can fully discharge its office. Without enough good blood, no nerve, muscle, membrane, or other tissue can be efficiently repaired. Without enough good blood, growth will neither be sound nor sufficient. Judge, then, how bad must be the consequences when to a growing body the weakened stomach supplies blood that is deficient in quant.i.ty and poor in quality; while the debilitated heart propels this poor and scanty blood with unnatural slowness.
And if, as all who investigate the matter must admit, physical degeneracy is a consequence of excessive study, how grave is the condemnation to be pa.s.sed on this cramming-system above exemplified. It is a terrible mistake, from whatever point of view regarded. It is a mistake in so far as the mere acquirement of knowledge is concerned. For the mind, like the body, cannot a.s.similate beyond a certain rate; and if you ply it with facts faster than it can a.s.similate them, they are soon rejected again: instead of being built into the intellectual fabric, they fall out of recollection after the pa.s.sing of the examination for which they were got up. It is a mistake, too, because it tends to make study distasteful. Either through the painful a.s.sociations produced by ceaseless mental toil, or through the abnormal state of brain it leaves behind, it often generates an aversion to books; and, instead of that subsequent self-culture induced by rational education, there comes continued retrogression. It is a mistake, also, inasmuch as it a.s.sumes that the acquisition of knowledge is everything; and forgets that a much more important thing is the organisation of knowledge, for which time and spontaneous thinking are requisite. As Humboldt remarks respecting the progress of intelligence in general, that "the interpretation of Nature is obscured when the description languishes under too great an acc.u.mulation of insulated facts;" so, it may be remarked respecting the progress of individual intelligence, that the mind is over-burdened and hampered by an excess of ill-digested information. It is not the knowledge stored up as intellectual fat which is of value; but that which is turned into intellectual muscle. The mistake goes still deeper however. Even were the system good as producing intellectual efficiency, which it is not, it would still be bad, because, as we have shown, it is fatal to that vigour of _physique_ needful to make intellectual training available in the struggle of life. Those who, in eagerness to cultivate their pupils" minds, are reckless of their bodies, do not remember that success in the world depends more on energy than on information; and that a policy which in cramming with information undermines energy, is self-defeating. The strong will and untiring activity due to abundant animal vigour, go far to compensate even great defects of education; and when joined with that quite adequate education which may be obtained without sacrificing health, they ensure an easy victory over compet.i.tors enfeebled by excessive study: prodigies of learning though they may be.
A comparatively small and ill-made engine, worked at high pressure, will do more than a large and well-finished one worked at low-pressure. What folly is it, then, while finishing the engine, so to damage the boiler that it will not generate steam! Once more, the system is a mistake, as involving a false estimate of welfare in life. Even supposing it were a means to worldly success, instead of a means to worldly failure, yet, in the entailed ill-health, it would inflict a more than equivalent curse.
What boots it to have attained wealth, if the wealth is accompanied by ceaseless ailments? What is the worth of distinction, if it has brought hypochondria with it? Surely no one needs telling that a good digestion, a bounding pulse, and high spirits, are elements of happiness which no external advantages can out-balance. Chronic bodily disorder casts a gloom over the brightest prospects; while the vivacity of strong health gilds even misfortune. We contend, then, that this over-education is vicious in every way--vicious, as giving knowledge that will soon be forgotten; vicious, as producing a disgust for knowledge; vicious, as neglecting that organisation of knowledge which is more important than its acquisition; vicious, as weakening or destroying that energy without which a trained intellect is useless; vicious, as entailing that ill-health for which even success would not compensate, and which makes failure doubly bitter. On women the effects of this forcing system are, if possible, even more injurious than on men. Being in great measure debarred from those vigorous and enjoyable exercises of body by which boys mitigate the evils of excessive study, girls feel these evils in their full intensity. Hence, the much smaller proportion of them who grow up well-made and healthy. In the pale, angular, flat-chested young ladies, so abundant in London drawing-rooms, we see the effect of merciless application, unrelieved by youthful sports; and this physical degeneracy hinders their welfare far more than their many accomplishments aid it. Mammas anxious to make their daughters attractive, could scarcely choose a course more fatal than this, which sacrifices the body to the mind. Either they disregard the tastes of the opposite s.e.x, or else their conception of those tastes is erroneous. Men care little for erudition in women; but very much for physical beauty, good nature, and sound sense. How many conquests does the blue-stocking make through her extensive knowledge of history? What man ever fell in love with a woman because she understood Italian? Where is the Edwin who was brought to Angelina"s feet by her German? But rosy cheeks and laughing eyes are great attractions. A finely rounded figure draws admiring glances. The liveliness and good humour that overflowing health produces, go a great way towards establishing attachments. Every one knows cases where bodily perfections, in the absence of all other recommendations, have incited a pa.s.sion that carried all before it; but scarcely any one can point to a case where intellectual acquirements, apart from moral or physical attributes, have aroused such a feeling.
The truth is that, out of the many elements uniting in various proportions to produce in a man"s breast the complex emotion we call love, the strongest are those produced by physical attractions; the next in order of strength are those produced by moral attractions; the weakest are those produced by intellectual attractions; and even these are dependent less on acquired knowledge than on natural faculty--quickness, wit, insight. If any think the a.s.sertion a derogatory one, and inveigh against the masculine character for being thus swayed; we reply that they little know what they say when they thus call in question the Divine ordinations. Even were there no obvious meaning in the arrangement, we might be sure that some important end was subserved. But the meaning is quite obvious to those who examine. When we remember that one of Nature"s ends, or rather her supreme end, is the welfare of posterity; further that, in so far as posterity are concerned, a cultivated intelligence based on a bad _physique_ is of little worth, since its descendants will die out in a generation or two; and conversely that a good _physique_, however poor the accompanying mental endowments, is worth preserving, because, throughout future generations, the mental endowments may be indefinitely developed; we perceive how important is the balance of instincts above described. But, advantage apart, the instincts being thus balanced, it is folly to persist in a system which undermines a girl"s const.i.tution that it may overload her memory. Educate as highly as possible--the higher the better--providing no bodily injury is entailed (and we may remark, in pa.s.sing, that a sufficiently high standard might be reached were the parrot-faculty cultivated less, and the human faculty more, and were the discipline extended over that now wasted period between leaving school and being married). But to educate in such manner, or to such extent, as to produce physical degeneracy, is to defeat the chief end for which the toil and cost and anxiety are submitted to. By subjecting their daughters to this high-pressure system, parents frequently ruin their prospects in life. Besides inflicting on them enfeebled health, with all its pains and disabilities and gloom; they not unfrequently doom them to celibacy.
The physical education of children is thus, in various ways, seriously faulty. It errs in deficient feeding; in deficient clothing; in deficient exercise (among girls at least); and in excessive mental application. Considering the regime as a whole, its tendency is too exacting: it asks too much and gives too little. In the extent to which it taxes the vital energies, it makes the juvenile life far more like the adult life than it should be. It overlooks the truth that, as in the foetus the entire vitality is expended in growth--as in the infant, the expenditure of vitality in growth is so great as to leave extremely little for either physical or mental action; so throughout childhood and youth, growth is the dominant requirement to which all others must be subordinated: a requirement which dictates the giving of much and the taking away of little--a requirement which, therefore, restricts the exertion of body and mind in proportion to the rapidity of growth--a requirement which permits the mental and physical activities to increase only as fast as the rate of growth diminishes.
The _rationale_ of this high-pressure education is that it results from our pa.s.sing phase of civilisation. In primitive times, when aggression and defence were the leading social activities, bodily vigour with its accompanying courage were the desiderata; and then education was almost wholly physical: mental cultivation was little cared for, and indeed, as in feudal ages, was often treated with contempt. But now that our state is relatively peaceful--now that muscular power is of use for little else than manual labour, while social success of nearly every kind depends very much on mental power; our education has become almost exclusively mental. Instead of respecting the body and ignoring the mind, we now respect the mind and ignore the body. Both these att.i.tudes are wrong. We do not yet realise the truth that as, in this life of ours, the physical underlies the mental, the mental must not be developed at the expense of the physical. The ancient and modern conceptions must be combined.
Perhaps nothing will so much hasten the time when body and mind will both be adequately cared for, as a diffusion of the belief that the preservation of health is a _duty_. Few seem conscious that there is such a thing as physical morality. Men"s habitual words and acts imply the idea that they are at liberty to treat their bodies as they please.
Disorders entailed by disobedience to Nature"s dictates, they regard simply as grievances: not as the effects of a conduct more or less flagitious. Though the evil consequences inflicted on their dependents, and on future generations, are often as great as those caused by crime; yet they do not think themselves in any degree criminal. It is true that, in the case of drunkenness, the viciousness of a bodily transgression is recognised; but none appear to infer that, if this bodily transgression is vicious, so too is every bodily transgression.
The fact is, that all breaches of the laws of health are _physical sins_. When this is generally seen, then, and perhaps not till then, will the physical training of the young receive the attention it deserves.
[1] _Cyclopaedia of Practical Medicine._
[2] _Cyclopaedia of Practical Medicine._
[3] _Cyclopaedia of Anatomy and Physiology._
[4] Morton"s _Cyclopaedia of Agriculture_.
[5] Morton"s _Cyclopaedia of Agriculture_.
[6] It is needful to remark that children whose legs and arms have been from the beginning habitually without covering, cease to be conscious that the exposed surfaces are cold; just as by use we have all ceased to be conscious that our faces are cold, even when out of doors. But though in such children the sensations no longer protest, it does not follow that the system escapes injury, any more than it follows that the Fuegian is undamaged by exposure, because he bears with indifference the melting of the falling snow on his naked body.
[7] We are not certain that the propagation of subdued forms of const.i.tutional disease through the agency of vaccination is not a part cause. Sundry facts in pathology suggest the inference, that when the system of a vaccinated child is excreting the vaccine virus by means of pustules, it will tend also to excrete through such pustules other morbific matters; especially if these morbific matters are of a kind ordinarily got rid of by the skin, as are some of the worst of them.
Hence it is very possible--probable even--that a child with a const.i.tutional taint, too slight to show itself in visible disease, may, through the medium of vitiated vaccine lymph taken from it, convey a like const.i.tutional taint to other children, and these to others.
[8] _Cyclopaedia of Practical Medicine_, vol. i. pp. 697, 698.
PART II
PROGRESS: ITS LAW AND CAUSE[1]
The current conception of Progress is somewhat shifting and indefinite.
Sometimes it comprehends little more than simple growth--as of a nation in the number of its members and the extent of territory over which it has spread. Sometimes it has reference to quant.i.ty of material products--as when the advance of agriculture and manufactures is the topic. Sometimes the superior quality of these products is contemplated: and sometimes the new or improved appliances by which they are produced.
When, again, we speak of moral or intellectual progress, we refer to the state of the individual or people exhibiting it; while, when the progress of Knowledge, of Science, of Art, is commented upon, we have in view certain abstract results of human thought and action. Not only, however, is the current conception of Progress more or less vague, but it is in great measure erroneous. It takes in not so much the reality of Progress as its accompaniments--not so much the substance as the shadow.
That progress in intelligence seen during the growth of the child into the man, or the savage into the philosopher, is commonly regarded as consisting in the greater number of facts known and laws understood: whereas the actual progress consists in those internal modifications of which this increased knowledge is the expression. Social progress is supposed to consist in the produce of a greater quant.i.ty and variety of the articles required for satisfying men"s wants; in the increasing security of person and property; in widening freedom of action: whereas, rightly understood, social progress consists in those changes of structure in the social organism which have entailed these consequences.
The current conception is a teleological one. The phenomena are contemplated solely as bearing on human happiness. Only those changes are held to const.i.tute progress which directly or indirectly tend to heighten human happiness. And they are thought to const.i.tute progress simply _because_ they tend to heighten human happiness. But rightly to understand progress, we must inquire what is the nature of these changes, considered apart from our interests. Ceasing, for example, to regard the successive geological modifications that have taken place in the Earth, as modifications that have gradually fitted it for the habitation of Man, and as _therefore_ a geological progress, we must seek to determine the character common to the modifications--the law to which they all conform. And similarly in every other case. Leaving out of sight concomitants and beneficial consequences, let us ask what Progress is in itself.
In respect to that progress which individual organisms display in the course of their evolution, this question has been answered by the Germans. The investigations of Wolff, Goethe, and Von Baer, have established the truth that the series of changes gone through during the development of a seed into a tree, or an ovum into an animal, const.i.tute an advance from h.o.m.ogeneity of structure to heterogeneity of structure.
In its primary stage, every germ consists of a substance that is uniform throughout, both in texture and chemical composition. The first step is the appearance of a difference between two parts of this substance; or, as the phenomenon is called in physiological language, a differentiation. Each of these differentiated divisions presently begins itself to exhibit some contrast of parts; and by and by these secondary differentiations become as definite as the original one. This process is continuously repeated--is simultaneously going on in all parts of the growing embryo; and by endless such differentiations there is finally produced that complex combination of tissues and organs const.i.tuting the adult animal or plant. This is the history of all organisms whatever. It is settled beyond dispute that organic progress consists in a change from the h.o.m.ogeneous to the heterogeneous.
Now, we propose in the first place to show, that this law of organic progress is the law of all progress. Whether it be in the development of the Earth, in the development of Life upon its surface, in the development of Society, of Government, of Manufactures, of Commerce, of Language, Literature, Science, Art, this same evolution of the simple into the complex, through successive differentiations, holds throughout.
From the earliest traceable cosmical changes down to the latest results of civilisation, we shall find that the transformation of the h.o.m.ogeneous into the heterogeneous, is that in which Progress essentially consists.
With the view of showing that _if_ the Nebular Hypothesis be true, the genesis of the solar system supplies one ill.u.s.tration of this law, let us a.s.sume that the matter of which the sun and planets consist was once in a diffused form; and that from the gravitation of its atoms there resulted a gradual concentration. By the hypothesis, the solar system in its nascent state existed as an indefinitely extended and nearly h.o.m.ogeneous medium--a medium almost h.o.m.ogeneous in density, in temperature, and in other physical attributes. The first advance towards consolidation resulted in a differentiation between the occupied s.p.a.ce which the nebulous ma.s.s still filled, and the unoccupied s.p.a.ce which it previously filled. There simultaneously resulted a contrast in density and a contrast in temperature, between the interior and the exterior of this ma.s.s. And at the same time there arose throughout it rotatory movements, whose velocities varied according to their distances from its centre. These differentiations increased in number and degree until there was the organised group of sun, planets, and satellites, which we now know--a group which represents numerous contrasts of structure and action among its members. There are the immense contrasts between the sun and planets, in bulk and in weight; as well as the subordinate contrasts between one planet and another, and between the planets and their satellites. There is the similarly marked contrast between the sun as almost stationary, and the planets as moving round him with great velocity; while there are the secondary contrasts between the velocities and periods of the several planets, and between their simple revolutions and the double ones of their satellites, which have to move round their primaries while moving round the sun. There is the yet further strong contrast between the sun and the planets in respect of temperature; and there is reason to suppose that the planets and satellites differ from each other in their proper heat, as well as in the heat they receive from the sun.
When we bear in mind that, in addition to these various contrasts, the planets and satellites also differ in respect to their distances from each other and their primary; in respect to the inclinations of their orbits, the inclinations of their axes, their times of rotation on their axes, their specific gravities, and their physical const.i.tutions; we see what a high degree of heterogeneity the solar system exhibits, when compared with the almost complete h.o.m.ogeneity of the nebulous ma.s.s out of which it is supposed to have originated.
Pa.s.sing from this hypothetical ill.u.s.tration, which must be taken for what it is worth, without prejudice to the general argument, let us descend to a more certain order of evidence. It is now generally agreed among geologists that the Earth was at first a ma.s.s of molten matter; and that it is still fluid and incandescent at the distance of a few miles beneath its surface. Originally, then, it was h.o.m.ogeneous in consistence, and, in virtue of the circulation that takes place in heated fluids, must have been comparatively h.o.m.ogeneous in temperature; and it must have been surrounded by an atmosphere consisting partly of the elements of air and water, and partly of those various other elements which a.s.sume a gaseous form at high temperatures. That slow cooling by radiation which is still going on at an inappreciable rate, and which, though originally far more rapid than now, necessarily required an immense time to produce any decided change, must ultimately have resulted in the solidification of the portion most able to part with its heat--namely, the surface. In the thin crust thus formed we have the first marked differentiation. A still further cooling, a consequent thickening of this crust, and an accompanying deposition of all solidifiable elements contained in the atmosphere, must finally have been followed by the condensation of the water previously existing as vapour. A second marked differentiation must thus have arisen: and as the condensation must have taken place on the coolest parts of the surface--namely, about the poles--there must thus have resulted the first geographical distinction of parts. To these ill.u.s.trations of growing heterogeneity, which, though deduced from the known laws of matter, may be regarded as more or less hypothetical, Geology adds an extensive series that have been inductively established. Its investigations show that the Earth has been continually becoming more heterogeneous in virtue of the multiplication of the strata which form its crust; further, that it has been becoming more heterogeneous in respect of the composition of these strata, the latter of which, being made from the detritus of the older ones, are many of them rendered highly complex by the mixture of materials they contain; and that this heterogeneity has been vastly increased by the action of the Earth"s still molten nucleus upon its envelope, whence have resulted not only a great variety of igneous rocks, but the tilting up of sedimentary strata at all angles, the formation of faults and metallic veins, the production of endless dislocations and irregularities. Yet again, geologists teach us that the Earth"s surface has been growing more varied in elevation--that the most ancient mountain systems are the smallest, and the Andes and Himalayas the most modern; while in all probability there have been corresponding changes in the bed of the ocean. As a consequence of these ceaseless differentiations, we now find that no considerable portion of the Earth"s exposed surface is like any other portion, either in contour, in geologic structure, or in chemical composition; and that in most parts it changes from mile to mile in all these characteristics.
Moreover, it must not be forgotten that there has been simultaneously going on a gradual differentiation of climates. As fast as the Earth cooled and its crust solidified, there arose appreciable differences in temperature between those parts of its surface most exposed to the sun and those less exposed. Gradually, as the cooling progressed, these differences became more p.r.o.nounced; until there finally resulted those marked contrasts between regions of perpetual ice and snow, regions where winter and summer alternately reign for periods varying according to the lat.i.tude, and regions where summer follows summer with scarcely an appreciable variation. At the same time the successive elevations and subsidences of different portions of the Earth"s crust, tending as they have done to the present irregular distribution of land and sea, have entailed various modifications of climate beyond those dependent on lat.i.tude; while a yet further series of such modifications have been produced by increasing differences of elevation in the land, which have in sundry places brought arctic, temperate, and tropical climates to within a few miles of each other. And the general result of these changes is, that not only has every extensive region its own meteorologic conditions, but that every locality in each region differs more or less from others in those conditions, as in its structure, its contour, its soil. Thus, between our existing Earth, the phenomena of whose varied crust neither geographers, geologists, mineralogists, nor meteorologists have yet enumerated, and the molten globe out of which it was evolved, the contrast in heterogeneity is sufficiently striking.