| → I can see no reason to doubt that 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| ↑ 1 blocks not present in 1859 1860; present in 1861 1866 1869 1872 |
| We have seen how in Florida
the colour of the hogs, when feeding
on the "paint root,"
determines
whether they shall live or die.
|
|
| → probably 1859 1860 1861 1866 |
| may have 1869 |
| have no doubt 1872 |
|
| → is, however, far more 1859 1860 1861 1866 |
| is also 1869 1872 |
|
| → there are many unknown 1859 1860 1861 1866 |
| owing to the 1869 1872 |
|
| → of growth, which, 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| → of the organisation is modified through variation, 1859 1860 |
| of the organisation is modified through variation 1861 1866 |
| varies, 1869 1872 |
|
| → for the good 1859 1860 1861 1866 |
| other modifications, often 1869 1872 |
|
|
parts of the Continent persons are warned not to keep white pigeons, as being the most liable to destruction. Hence
→I can see no reason to doubt that
natural selection might be
effective in giving the proper colour to each kind of grouse, and in keeping that colour, when once acquired, true and constant. Nor ought we to think that the occasional destruction of an animal of any particular colour would produce little effect: we should remember how essential it is in a flock of white sheep to destroy
lamb with the faintest trace of black. ↑
In
the down on the fruit and the colour of the flesh are considered by botanists as characters of the most trifling importance: yet we hear from an excellent horticulturist, Downing, that in the United States smooth-skinned fruits suffer far more from a beetle, a
than those with down; that purple plums suffer far more from a certain disease than yellow
whereas another disease attacks yellow-fleshed peaches far more than those with other coloured flesh. If, with all the aids of art, these slight differences make a great difference in cultivating the several varieties, assuredly, in a state of nature, where the trees would have to struggle with other trees and with a host of enemies, such differences would effectually settle which variety, whether a smooth or downy, a yellow or purple fleshed fruit, should succeed. |
|
| In looking at many small points of difference between species, which, as far as our ignorance permits us to judge, seem
quite unimportant, we must not forget that climate, food, &c.,
→probably
some
direct effect. It
→is, however, far more
necessary to bear in mind
→there are many unknown
of
→of growth, which,
when one part
→of the organisation is modified through variation,
and the
are accumulated
natural
→for the good
|
