Origin of Species Variorum

→ OMIT 1869 1872

the species of some other genus, are 1859 1860 1861 1866

→ are called generic characters; 1869 1872

characters; 1859 1860 1861 1866

→ may be 1872

in common I 1859 1860 1861 1866 1869

→ before the 1869 1872

a remote period, since that 1859 1860 1861 1866

→ species branched off 1869 1872

branching off of the species 1859 1860 1861 1866

→ I think it will be admitted by naturalists, without my entering on details, that secondary sexual characters are highly variable. 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

→ It will also 1872

I think it will 1859 1860 1861 1866 1869

→ that species of the same group differ from each other more widely in their 1872

without my entering on details, that 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

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

→ are strongly displayed, with 1872

than in other parts of their organisation; compare, for instance, 1859 1860 1861 1866 1869

→ females. 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

→ for they are 1872

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

→ these 1872

their sexual characters, 1859 1860 1861 1866 1869

→ respects. 1872

parts of their structure. 1859 1860 1861 1866 1869

→ in illus- tration the two first instances 1872

in illustration two instances, the first 1859 1860 1861 1866

two instances in illustration, the first 1869

continuing to vary in those parts of their structure which

had

have

varied within a moderately recent period, and which

had

have

thus come to differ. Or to state the case in another

manner: —

manner:—

the points in which all the species of a genus resemble each other, and in which they differ from →OMIT

called

allied

generic

genera,

→are called generic characters; and these characters →may be

attribute

attributed

in- heritance

inheritance

from a common progenitor, for it can rarely have happened that natural selection will have modified several

species,

distinct 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 →before the period when the

species

different species

several 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

within

since

the period

when

the →species branched off 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.

Secondary

Sexual

Characters

Variable .

Variable .—

→I think it will be admitted by naturalists, without my entering on details, that secondary sexual characters are highly variable. →It will also be

admitted,

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,

characters

→are strongly displayed, with the amount of difference between the →females. The cause of the original variability of

secondary sexual

these

characters is not manifest; but we can see why

these characters

they

should not have been rendered as constant and uniform as

other

others,

→for they are accumulated by sexual selection, which is less rigid in its action than ordinary selection, as it does not entail death, but only gives fewer offspring to the less favoured males. Whatever the cause may be of the variability of secondary sexual characters, as they are highly variable, sexual selection will have had a wide scope for action, and may thus

readily

....

have

suc- ceeded

succeeded

in giving to the species of the same group a greater amount of difference in →these than in other →respects.

It is a remarkable fact, that the secondary

sexual

....

differences between the two sexes of the same species are generally displayed in the very same parts of the organisation in which the

different

....

species of the same genus differ from each other. Of this fact I will give →in illus- tration the two first instances