See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1861
1866
1869
1872

a remote period, since that 1859 1860 1861 1866
before the 1869 1872

branching off of the species 1859 1860 1861 1866
species branched off 1869 1872

←Subtitle not present 1859 1860 1861 Secondary Sexual Characters Variable . 1866 1869 1872
In connexion with the present subject, I will make only two other remarks. 1859 1860 1861 1866
In connection with the present subject, I will make only two other remarks. 1869
I think it will be admitted by naturalists, without my entering on details, that secondary sexual characters are highly variable. 1872

I think it will 1859 1860 1861 1866 1869
It will also 1872

without my entering on details, that 1859 1860 1861 1866 1869
that species of the same group differ from each other more widely in their 1872

are very variable; I think it also will be admitted that species of the same group differ from each other more widely in their 1859 1860 1861 1866 1869
than in other parts of their organisation: compare, for instance, the amount of difference between the males of gallinaceous birds, in which 1872

than in other parts of their organisation; compare, for instance, 1859 1860 1861 1866 1869
are strongly displayed, with 1872

males of gallinaceous birds, in which secondary sexual characters are strongly displayed, with the amount of difference between their females; and the truth of this proposition will be granted. 1859 1860 1861 1866
males of gallinaceous birds, in which secondary sexual characters are strongly displayed, with the amount of difference between the females; and the truth of this proposition will be granted. 1869
females. 1872

parts of the organisation; for secondary sexual characters have been 1859 1860 1861 1866 1869
for they are 1872

from a common progenitor, for it can rarely have happened that natural selection will have modified several
distinct species,
species,
fitted to more or less widely-different habits, in exactly the same manner: and as these so-called generic characters have been inherited from a remote period, since that period when the
different species
several species
species
first branched off from their common progenitor, and subsequently have not varied or come to differ in any degree, or only in a slight degree, it is not probable that they should vary at the present day. On the other hand, the points in which species differ from other species of the same
genus
genus,
are called specific characters; and as these specific characters have varied and come to differ
since
within
the period
when
of
the branching off of the species from a common progenitor, it is probable that they should still often be in some degree
variable, —
variable,—
at least more variable than those parts of the
organization
organisation
which have for a very long period remained constant.
In connexion with the present subject, I will make only two other remarks. I think it will be
admitted
admitted,
without my entering on details, that secondary sexual
characters,
characters
are very variable; I think it also will be admitted that species of the same group differ from each other more widely in their secondary sexual
characters
characters,
than in other parts of their organisation; compare, for instance, the amount of difference between the males of gallinaceous birds, in which secondary sexual characters are strongly displayed, with the amount of difference between their females; and the truth of this proposition will be granted. The cause of the original variability of
these
secondary sexual
characters is not manifest; but we can see why
they
these characters
should not have been rendered as constant and uniform as
others,
other
parts of the organisation; for secondary sexual characters have been accumulated by sexual selection, which