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1859
1860
1861
1866
1869
1872

Compare with:
1860
1861
1866
1869
1872

and females to different habits of life, or the males 1859 1860 1861 1866 1869
OMIT 1872

the species possess in common;— 1859 1860 1861
the species possess in common; — 1866 1869
are possessed by all the species;— 1872

these same characters between 1859 1860 1861 1866 1869
OMIT 1872

having descended from 1859 1860 1861 1866 1869
being the descendants of 1872

thus 1859
having been thus 1860 1861 1866 1869 1872

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
slight
not great
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 and ordinary specific differences are generally displayed in the same parts of the
organisation, —
organisation,—
are all principles closely connected together. All being mainly due to the species of the same group having descended from a common progenitor, from whom they have inherited much in
common, —
common,—
to parts which have recently and largely varied being more likely still to go on varying than parts which have long been inherited and have not
varied, —
varied—
varied,—
to natural selection having more or less completely, according to the lapse of time, overmastered the tendency to reversion and to further
variability, —
variability,—
to sexual selection being less rigid than ordinary
selection, —
selection,—
and to variations in the same parts having been accumulated by natural and sexual selection, and thus adapted for secondary sexual, and for ordinary
specific
specific
purposes.