Origin of Species Variorum

→ 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

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