increase, increase, 1859 | their increase, 1860 1861 1866 1869 1872 |
will be
treated of. treated of. 1859 1860 1861 1866 1869 | considered. 1872 |
This is the doctrine of Malthus, applied to the whole animal and vegetable kingdoms. As many more individuals of each species are born than can possibly survive; and as, consequently, there is a frequently
recurring recurring 1859 1860 1861 1866 1869 | recurrent 1872 |
struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of surviving, and thus be naturally selected. From the strong principle of inheritance, any selected variety will tend to propagate its new and modified form. |
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This fundamental subject of Natural Selection will be treated at some length in the fourth chapter; and we shall then see how Natural Selection almost inevitably causes much Extinction of the less improved forms of life, and
induces induces 1859 | leads to 1860 1861 1866 1869 1872 |
what I have called Divergence of Character. In the next chapter I shall discuss the complex and little known laws of
variation variation 1859 1860 1861 1866 | variation. 1869 1872 |
and and 1859 1860 1861 1866 | and 1869 1872 |
of of 1859 1860 1861 1866 | of 1869 1872 |
correlation correlation 1859 1860 1861 1866 | correlation 1869 1872 |
of of 1859 1860 1861 1866 | of 1869 1872 |
growth. growth. 1859 1860 1861 1866 | growth. 1869 1872 |
In the
four four 1859 1860 1861 1866 1869 | five 1872 |
succeeding chapters, the most apparent and gravest difficulties
on on 1859 1860 1861 1866 | in accepting 1869 1872 |
the theory will be given: namely, first, the difficulties of transitions, or
in understanding in understanding 1859 1860 1861 1866 | in understanding 1869 1872 |
how a simple being or a simple organ can be changed and perfected into a highly developed being or
elaborately elaborately 1859 1860 1861 1866 |
into an elaborately 1869 1872 |
constructed organ; secondly, the subject of Instinct, or the mental powers of animals; thirdly, Hybridism, or the infertility of species and the fertility of varieties when intercrossed; and fourthly, the imperfection of the Geological Record. In the next chapter I shall consider the geological succession of organic beings throughout time; in the
eleventh eleventh 1859 1860 1861 1866 1869 | twelfth 1872 |
and
twelfth, twelfth, 1859 1860 1861 1866 1869 | thirteenth, 1872 |
their geographical distribution throughout space; in the
thirteenth, thirteenth, 1859 1860 1861 1866 1869 | fourteenth, 1872 |
their classification or mutual affinities, both when mature and in an embryonic condition. In the last chapter I shall give a
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