| ↑ 1 blocks not present in 1869; present in 1861 1866 1872 1859 1860 |
| Natural selection, on the principle of qualities being inherited at corresponding ages, can modify the egg, seed, or young, as easily as the adult.
|
|
| → OMIT 1869 1872 |
| nature, in modifying and 1859 1860 1861 1866 |
|
| → OMIT 1861 1866 1869 1872 |
| more living beings can be supported on the same area 1859 1860 |
|
| → by so much can a greater number be supported on the same area,— of 1869 |
| of 1859 1860 |
| by so much a greater number can be supported on the same area,— of 1861 1866 |
| 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 |
|
|
low and simple forms
long endure if well fitted for their simple conditions of
↑ |
|
| 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. |
|
| Whether natural selection has really thus acted in
→OMIT
adapting the various forms of life to their several conditions and stations, must be judged
by the general
and balance of
given in the following chapters. But we
how it entails extinction; and how largely extinction has acted in the
history, geology plainly declares. Natural selection, also, leads to divergence of character; for
→OMIT
the more
diverge in structure, habits, and constitution,
→by so much can a greater number be supported on the same area,— of
which we see proof by looking
the inhabitants of any small
→or to naturalised productions.
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
descendants become, the better will be their chance of
in the battle
life. Thus the small differences distinguishing varieties of the same species,
steadily tend to
till they
equal the greater differences between species of the same genus, or even of distinct
|
