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1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1861
1869
1872

with 1859 1860 1861 1866
or rivalry with 1872

males. 1859 1860 1861 1866
males; and these characters will be transmitted to one sex or to both sexes, according to the form of inheritance which prevails. 1872

3 blocks not present in 1859 1860 1861 1866 1872; present in 1869
Natural selection, on the principle of qualities being inherited at corresponding ages, can modify the egg, seed, or young, as easily as the adult. Amongst many animals, sexual selection will give its aid to ordinary selection, by assuring to the most vigorous and best adapted males the greatest number of offspring. Sexual selection will also give characters useful only to the males, in their struggles with other males; and these characters will be transmitted to one sex or to both sexes, according to the form of inheritance which prevails.

nature, in modifying and 1859 1860 1861 1866
OMIT 1869 1872

OMIT 1861 1866 1869 1872
more living beings can be supported on the same area 1859 1860

by so much a greater number can be supported on the same area,— of 1861 1866
of 1859 1860
by so much can a greater number be supported on the same area,— of 1869
by so much the more can a large number be supported on the same area,— of 1872

or to naturalised productions. 1860 1861 1866 1869
or at naturalised productions. 1859
and to the productions naturalised in foreign lands. 1872

within each class, which 1861 1866 1869 1872
which 1859 1860

animals, sexual selection will
have given
give
its aid to ordinary selection, by assuring to the most vigorous and best adapted males the greatest number of offspring. Sexual selection will also give characters useful to the males alone, in their struggles with other males.
Whether natural selection has really thus acted in nature, in modifying and adapting the various forms of life to their several conditions and stations, must be judged
of
of
by the general
tenour
tenor
and balance of
the evidence
evidence
given in the following chapters. But we
have already
already
seen
see
how it entails extinction; and how largely extinction has acted in the
worlds
world's
history, geology plainly declares. Natural selection, also, leads to divergence of character; for OMIT the more
they
organic beings
diverge in structure, habits, and constitution, by so much a greater number can be supported on the same area,— of which we see proof by looking
at
to
the inhabitants of any small
spot,
spot
or to naturalised productions.
Therefore
Therefore,
during the modification of the descendants of any one species, and during the incessant struggle of all species to increase in numbers, the more diversified
the
these
descendants become, the better will be their chance of
success
succeeding
in the battle
of
for
life. Thus the small differences distinguishing varieties of the same species,
will
....
steadily tend to
increase,
increase
till they
come to
come to
equal the greater differences between species of the same genus, or even of distinct genera.
We have seen that it is the common, the
widely diffused,
widely-diffused,
and
widely ranging
widely-ranging
species, belonging to the larger
genera,
genera
within each class, which vary most; and these
will
....
tend to transmit to their modified offspring that superiority which now makes them dominant in their own countries. Natural selection, as has just been remarked, leads to divergence of character and to much extinction of the less improved and intermediate forms