On the Origin of Species

Renew：Part 18
Author：Charles Darwin
Update：08-15-2023
Tags：Politics Social Science
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Chapter List

Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter that the same principle applies to the whole individual; for in a district where many species of any genus are found--that is, where there has been much former variation and differentiation, or where the manufactory of new specific forms has been actively at work--there, on an average, we now find most varieties or incipient species. Secondary s.e.xual characters are highly variable, and such characters differ much in the species of the same group. Variability in the same parts of the organisation has generally been taken advantage of in giving secondary s.e.xual differences to the s.e.xes of the same species, and specific differences to the several species of the same genus. Any part or organ developed to an extraordinary size or in an extraordinary manner, in comparison with the same part or organ in the allied species, must have gone through an extraordinary amount of modification since the genus arose; and thus we can understand why it should often still be variable in a much higher degree than other parts; for variation is a long-continued and slow process, and natural selection will in such cases not as yet have had time to overcome the tendency to further variability and to reversion to a less modified state. But when a species with any extraordinarily-developed organ has become the parent of many modified descendants--which on my view must be a very slow process, requiring a long lapse of time--in this case, natural selection may readily have succeeded in giving a fixed character to the organ, in however extraordinary a manner it may be developed. Species inheriting nearly the same const.i.tution from a common parent and exposed to similar influences will naturally tend to present a.n.a.logous variations, and these same species may occasionally revert to some of the characters of their ancient progenitors. Although new and important modifications may not arise from reversion and a.n.a.logous variation, such modifications will add to the beautiful and harmonious diversity of nature.
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18