Thoroughly familiar with the Amazons and its affluents, at home with the Indians, among whom he had often lived, he was the pearl of traveling companions as well as a valuable addition to the scientific force. Aga.s.siz left the Amazonian valley in April, and the two remaining months of his stay in Brazil were devoted to excursions along the coast, especially in the mountains back of Ceara, and in the Organ mountains near Rio de Janeiro.
From beginning to end this journey fulfilled Aga.s.siz"s brightest antic.i.p.ations. Mr. Thayer, whose generosity first placed the expedition on so broad a scientific basis, continued to give it his cordial support till the last specimen was stored in the Museum.
The interest taken in it by the Emperor of Brazil, and the liberality of the government toward it, also facilitated all Aga.s.siz"s aims and smoothed every difficulty in the path. On starting he had set before himself two subjects of inquiry. These were, first, the fresh-water fauna of Brazil, of the greater interest to him, because of the work on the Brazilian Fishes, with which his scientific career had opened; and second, her glacial history, for he believed that even these lat.i.tudes must have been, to a greater or less degree, included in the ice-period. The first three months spent in Rio de Janeiro and its environs gave him the key to phenomena connected with both these subjects, and he followed them from there to the head-waters of the Amazons, as an Indian follows a trail. The distribution of life in the rivers and lakes of Brazil, the immense number of species and their local circ.u.mscription, as distinct faunae in definite areas of the same water-basin, amazed him; while the character of the soil and other geological features confirmed him in his preconceived belief that the glacial period could not have been less than cosmic in its influence. He was satisfied that the tropical, as well as the temperate and arctic regions, had been, although in a less degree, fashioned by ice.
Just before leaving the United States he received a letter of friendly farewell from Charles Sumner, and his answer, written on the Rio Negro, gives some idea of the conditions under which he traveled, and of the results he had obtained. As the letters explain each other, both are given here.
FROM CHARLES SUMNER.
WASHINGTON, March 20, 1865.
MY DEAR AGa.s.sIZ,
It is a beautiful expedition that you are about to commence,--in contrast with the deeds of war. And yet you are going forth to conquer new realms, and bring them under a sway they have not yet known. But science is peaceful and bloodless in her conquests. May you return victorious! I am sure you will. Of course you will see the Emperor of Brazil, whose enlightened character is one of the happy accidents of government. . .You are a naturalist; but you are a patriot also. If you can take advantage of the opportunities which you will surely enjoy, and plead for our country, to the end that its rights may be understood, and the hardships it has been obliged to endure may be appreciated, you will render a service to the cause of international peace and good-will.
You are to have great enjoyment. I imagine you already very happy in the scenes before you. I, too, should like to see Nature in her most splendid robes; but I must stay at home and help keep the peace. Good-by--Bon voyage!
Ever sincerely yours,
CHARLES SUMNER.
TO CHARLES SUMNER.
RIO NEGRO; ON BOARD THE BRAZILIAN WAR STEAMER IBICUHY, December 26, 1865.
MY DEAR SUMNER,
The heading of these lines tells a long and interesting story. Here I am, sailing on the Rio Negro, with my wife and a young Brazilian friend, provided with all the facilities which modern improvements, the extraordinary liberality of the Brazilian government, and the kindness of our commander can bestow, and pursuing my scientific investigations with as much ease as if I were in my study, or in the Museum at Cambridge,--with this enormous difference, that I am writing on deck, protected by an awning from the hot sun, and surrounded by all the luxuriance of the richest tropical vegetation.
The kind reception I met at the hands of the emperor on my arrival at Rio has been followed by every possible attention and mark of good-will toward me personally, but usually tendered in such a way as to show that an expression of cordiality toward the United States was intended also in the friendly feeling with which everything was done to facilitate my researches. In the first place, the emperor gave me as a traveling companion an extremely intelligent and well-educated Brazilian, the man of all others whom I should have chosen had I been consulted beforehand; and for the six months during which we have been on our journey here, I have not been able to spend a dollar except for my personal comfort, and for my collections. All charges for transportation of persons and baggage in public conveyances, as well as for specimens, have everywhere been remitted by order of the government. This is not all; when we reached Para the Brazilian Steamship Company placed a steamer at my disposal, that I might stop where I pleased on the way, and tarry as long as I liked instead of following the ordinary line of travel. In this way I ascended the Amazons to Manaos, and from there, by the ordinary steamer, reached the borders of Peru, making prolonged stays at Manaos and at Ega, and sending out exploring parties up the Javary, the Jutay, the Ica, etc. On my return to Manaos, at the junction of the Rio Negro and the Amazons, I found the Ibicuhy awaiting me with an order from the Minister of Public Works, placing her at my disposal for the remainder of my stay in the waters of the Amazons.
The Ibicuhy is a pretty little war steamer of 120 horse power, carrying six thirty-two pound guns. On board of her, and in company with the President of the Province, I have already visited that extraordinary network of river anastomoses and lakes, stretching between the river Madeira and the Amazons to the river Tapajos, and now I am ascending the Rio Negro, with the intention of going up as far as the junction of the Rio Branco with the Rio Negro. That the Brazilian government should be able and willing to offer such facilities for the benefit of science, during a time of war, when all the resources of the nation are called upon in order to put an end to the barbarism of Paraguay, is a most significant sign of the tendencies prevailing in the administration. There can be no doubt that the emperor is the soul of the whole. This liberality has enabled me to devote all my resources to the making of collections, and the result of my researches has, of course, been proportionate to the facilities I have enjoyed. Thus far, the whole number of fishes known from the Amazons has amounted to a little over one hundred, counting everything that may exist from these waters, in the Jardin des Plantes, the British Museum, the museums of Munich, Berlin, Vienna, etc.; while I have collected and now hold, in good state of preservation, fourteen hundred and forty-two species, and may get a few hundred more before returning to Para. I have so many duplicates that I may make every other museum tributary to ours, so far as the fresh-water animals of Brazil are concerned. This may seem very unimportant to a statesman. But I am satisfied that it affords a standard by which to estimate the resources of Brazil, as they may be hereafter developed. The basin of the Amazons is another Mississippi, having a tropical climate, tempered by moisture. Here is room for a hundred million happy human beings.
Ever truly your friend,
L. AGa.s.sIZ.
The repose of the return voyage, after sixteen months of such uninterrupted work, and of fresh impressions daily crowding upon each other, was most grateful to Aga.s.siz. The summary of this delightful journey may close as it began with a letter to his mother.
AT SEA, July 7, 1866.
DEAR MOTHER,
When you receive this letter we shall be, I hope, at Nahant, where our children and grandchildren are waiting for us. To-morrow we shall stop at Pernambuco, where I shall mail my letter to you by a French steamer.
I leave Brazil with great regret. I have pa.s.sed nearly sixteen months in the uninterrupted enjoyment of this incomparable tropical nature, and I have learned many things which have enlarged my range of thought, both concerning organized beings and concerning the structure of the earth. I have found traces of glaciers under this burning sky; a proof that our earth has undergone changes of temperature more considerable than even our most advanced glacialists have dared to suggest. Imagine, if you can, floating ice under the equator, such as now exists on the coasts of Greenland, and you will probably have an approximate idea of the aspect of the Atlantic Ocean at that epoch.
It is, however, in the basin of the Amazons especially, that my researches have been crowned with an unexpected success. Spix and Martius, for whose journey I wrote, as you doubtless remember, my first work on fishes, brought back from there some fifty species, and the sum total known now, taking the results of all the travelers who have followed up the inquiry, does not amount to two hundred. I had hoped, in making fishes the special object of my researches, to add perhaps a hundred more. You will understand my surprise when I rapidly obtained five or six hundred, and finally, on leaving Para, brought away nearly two thousand,--that is to say, ten times more than were known when I began my journey.* (* This estimate was made in the field when close comparison of specimens from distant localities was out of the question. The whole collection has never been worked up, and it is possible that the number of new species it contains, though undoubtedly greatly in excess of those previously known from the Amazons, may prove to be less than was at first supposed.--ED.) A great part of this success is due to the unusual facilities granted me by the Brazilian government. . .To the Emperor of Brazil I owe the warmest grat.i.tude. His kindness to me has been beyond all bounds. . .He even made for me, while he was with the army last summer, a collection of fishes from the province of Rio Grande du Sud. This collection would do honor to a professional naturalist. . .
Good-by, dear mother.
With all my heart,
YOUR LOUIS.
The following letter from old Professor Martius in Munich, of uncertain date, but probably in answer to one of March, 1866, is interesting, as connecting this journey with his own Brazilian expedition almost half a century before.
FROM PROFESSOR MARTIUS.
February 26, 1867.
MY DEAR FRIEND,
Your letter of March 20th last year was most gratifying to me as a token of your affectionate remembrance. You will easily believe that I followed your journey on the Amazons with the greatest interest, and without any alloy of envy, though your expedition was undertaken forty years later than mine, and under circ.u.mstances so much more favorable. Bates, who lived for years in that country, has borne me witness that I was not wanting in courage and industry during an exploration which lasted eleven months; and I therefore believe that you also, in reviewing on the spot my description of the journey, will not have pa.s.sed an unfavorable judgment. Our greatest difficulty was the small size of our boat which was so weak as to make the crossing of the river always dangerous. I shall look forward with great pleasure to the more detailed account of your journey, and also the plan of your route, which I hope you will send me. Can you tell me anything about the human skeletons at the Rio St. Antonio in St. Paul? I am very glad to know that you have paid especial attention to the palms, and I entreat you to send me the essential parts of every species which you hold to be new, because I wish to work out the palms for the Flora Brasiliensis this year. I wish I might find among them some new genus or species, which then should bear your name.
Do you intend to publish an account of your journey, or shall you confine yourself entirely to a report on your observations on Natural History? With a desire to explain the numerous names of animals, plants, and places, which are derived from the Tupee language, I have studied it for years that I might be able to use it fluently. Perhaps you have seen my "Glossaria lignareus brasiliensium." It contains also 1150 names of animals. To this work belong, likewise, my ethnographical contributions, of which forty-five sheets are already printed, to be published I hope next year. I am curious to hear your geological conclusions. I am myself inclined to the belief that men existed in South America previous to the latest geological catastrophes. As you have seen so many North American Indians, you will be able to give interesting explanations of their somatic relations to the South American Indians. Why could you not send me, as secretary of the mathematical and physical section, a short report of your princ.i.p.al results? It would then be printed in the report of our meetings, which, as the forerunner of other publications, could hardly fail to be agreeable to you. You no doubt see our friend Asa Gray occasionally. Remember me cordially to him, and tell him I look eagerly for an answer to my last letter. The year "sixty-six has taken from us many eminent botanists, Gusone, Mettenius, Von Schlechtendal, and Fresenius. I hear but rarely from our excellent friend Alexander Braun. He does not resist the approach of old age so well as you, my dear friend. You are still the active naturalist, fresh and well preserved, to judge by your photograph.
Thank you for it; I send mine in return. My wife still holds in warm remembrance the days when you, a bright, pleasant young fellow, used to come and see us,--what a long stretch of time lies between. Much is changed about me. Of former friends only Kobell and Vogel remain; Zuccarini, Wagner, Oken, Sch.e.l.ling, Sieber, Fuchs, Walther,--all these have gone home. All the pleasanter is it that you, on the other side of the ocean, think sometimes of your old friend, to whom a letter from you will be always welcome.
Remember me to your family, though I am not known to them. May the present year bring you health, cheerfulness, and the full enjoyment of your great and glorious success.
With warm esteem and friendship, always yours,
MARTIUS.
Aga.s.siz arrived in Cambridge toward the end of August, 1866. After the first excitement of meeting family and friends was over, he took up his college and museum work again. He had left for Brazil at the close of a course before the Lowell Inst.i.tute, and his first public appearance after his return was on the same platform. The rush for tickets was far in excess of the supply, and he was welcomed with the most ardent enthusiasm. It continued unabated to the close, although the lectures borrowed no interest from personal adventure or incidents of travel, but dealt almost wholly with the intellectual results and larger scientific generalizations growing out of the expedition. Later in the winter he gave a course also at the Cooper Inst.i.tute, in New York, which awakened the same interest and drew crowds of listeners. The resolution offered by Bancroft, the historian, at the close of the course, gives an idea of its character, and coming from such a source, may not unfitly be transcribed here.
RESOLVED, That the thanks of this great a.s.sembly of delighted hearers be given to the ill.u.s.trious Professor Aga.s.siz, for the fullness of his instruction, for the clearness of his method of ill.u.s.tration, for his exposition of the idea as antecedent to form; of the superiority of the undying, original, and eternal force over its transient manifestations; for happy hours which pa.s.sed too rapidly away; for genial influences of which the memory will last through our lives.
All his leisure hours during the winter of 1867 were given to the review and arrangement of the great collections he had brought home.
TO SIR PHILIP DE GREY EGERTON.
MUSEUM OF COMPARATIVE ZOOLOGY, CAMBRIDGE, Ma.s.sACHUSETTS., March 26, 1867.
I know you will be pleased to hear that I have returned to the study of fishes, and that I am not likely to give it up again for years to come. My success in collecting in the Amazons has been so unexpected that it will take me years to give an account of what I have found, and I am bound to show that the strange statements that have gone abroad are strictly correct. Yes, I have about eighteen hundred new species of fishes from the basin of the Amazons! The collection is now in Cambridge, for the most part in good preservation. It suggests at once the idea that either the other rivers of the world have been very indifferently explored, or that tropical America nourishes a variety of animals unknown to other regions. In this dilemma it would be worth while to send some naturalist to investigate the Ganges or the Bramaputra, or some of the great Chinese rivers. Can it not be done by order of the British government?
Please send me whatever you may publish upon the fossil fishes in your possession. I frequently sigh for another session in your museum, and it is not improbable that I shall solicit an invitation from you in a few years, in order to revise my views of the whole subject in connection with what I am now learning of the living fishes. By the way, I have eleven hundred colored drawings of the species of Brazil made from life by my old friend Burkhardt, who accompanied me on this journey.
My recent studies have made me more adverse than ever to the new scientific doctrines which are flourishing now in England. This sensational zeal reminds me of what I experienced as a young man in Germany, when the physio-philosophy of Oken had invaded every centre of scientific activity; and yet, what is there left of it? I trust to outlive this mania also. As usual, I do not ask beforehand what you think of it, and I may have put my hand into a hornet"s nest; but you know your old friend Aga.s.s, and will forgive him if he hits a tender spot. . .
The summer of 1867 was pa.s.sed very tranquilly at his Nahant laboratory, in that quiet work with his specimens and his microscope which pleased him best. The following letter to Professor Benjamin Peirce, who was then Superintendent of the Coast Survey, shows, however, his unfailing interest in the bearing of scientific researches on questions of public utility.
TO PROFESSOR PEIRCE, SUPERINTENDENT OF THE COAST SURVEY.
NAHANT, September 11, 1867.
DEAR SIR,
Far from considering your request a tax upon my time, it gives me the greatest pleasure to have an opportunity of laying before you some statements and reflections, which I trust may satisfy you that geology and natural history can be made subservient to the great interests of a civilized community, to a far greater extent than is generally admitted.
The question of the harbor of Boston, for instance, has a geological and zoological side, thus far only indirectly considered. In order to ascertain whence the materials are derived which acc.u.mulate in the harbor, the sh.o.r.es ought to be studied geologically with a kind of accuracy and minuteness, never required by geological surveys made for economical purposes. The banks of the harbor, wherever it is not rock-bound, consist of drift, which itself rests upon the various rock formations of the district. Now this drift, as I have ascertained, formerly extended many miles beyond our present sh.o.r.es, and is still slowly washed away by the action of tides, winds, and currents. Until you know with precision the mineralogical composition of the drift of the immediate vicinity, so accurately indeed as to be able to recognize it in any new combination into which it may be brought when carried off by the sea, all your examination of soundings may be of little use.