| → in that district and amongst these species, 1861 1866 1869 1872 |
| there, on an average, 1859 1860 |
|
| → on an average, most varieties. 1861 1866 1869 1872 |
| most varieties or incipient species. 1859 1860 |
|
| → long-continued 1859 1860 1861 1866 1872 |
| long - continued 1869 |
|
| → may readily have 1859 1860 1861 1866 |
| has 1869 1872 |
|
|
In these remarks we have referred to special parts or organs being still variable, because they have recently varied and thus come to differ; but we have also seen in the second
that the same principle applies to the whole individual; for in a district where many species of
genus are
that is, where there has been much former variation and differentiation, or where the manufactory of new specific forms has been actively at
→in that district and amongst these species,
we now
→on an average, most varieties. Secondary sexual 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 sexual differences to the
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
which on
view must be a very slow process, requiring a long
of
in this case, natural selection
→may readily have
succeeded in giving a fixed character to the organ, in however extraordinary a manner it may
developed. Species inheriting nearly the same constitution from a common
and exposed
|
