Origin of Species Variorum

→ of the subject: 1859 1860 1861 1866 1869

OMIT 1872

→ and females to different habits of life, or the males 1859 1860 1861 1866 1869

OMIT 1872

→ the species possess in common; — 1866 1869

the species possess in common;— 1859 1860 1861

are possessed by all the species;— 1872

→ these same characters between 1859 1860 1861 1866 1869

OMIT 1872

wings is a character of the highest importance, because common to large groups; but in certain genera the neuration differs in the different species, and likewise in the two sexes of the same species.

Mr.

Sir J.

Lubbock has recently remarked, that several minute crustaceans offer excellent illustrations of this law. "In Pontella, for instance, the sexual characters are afforded mainly by the anterior

antennae

antennæ

and by the fifth pair of legs: the specific differences also are principally given by these organs." This relation has a clear meaning on my

view:

view

→of the subject: I look at all the species of the same genus as having as certainly descended from

a common

the same

progenitor, as have the two sexes of any one

~~of the~~

of the

species.

Consequently

Consequently,

whatever part of the structure of the common progenitor, or of its early descendants, became

variable;

variable,

variations of this part would, it is highly probable, be taken advantage of by natural and sexual selection, in order to fit the several species to their several places in the economy of nature, and likewise to fit the two sexes of the same species to each other, or to fit the males →and females to different habits of life, or the males to struggle with other males for the possession of the females.

Finally, then, I conclude that the greater variability of specific characters, or those which distinguish species from species, than of generic characters, or those which →the species possess in common; — that the frequent extreme variability of any part which is developed in a species in an extraordinary manner in comparison with the same part in its congeners; and the

not great

slight

degree of variability in a part, however extraordinarily it may be developed, if it be common to a whole group of

species;—

species; —

that the great variability of secondary sexual characters, and

their

the

great

~~amount of~~

amount of

difference in →these same characters between closely allied

species;—

species; —

that secondary sexual