| → of each slight variation or individual difference; 1869 1872 |
| producing slight and unimportant variations; 1859 1860 1861 1866 |
|
| ↑ 1 blocks not present in 1859 1860 1861 1866 1869; present in 1872 |
| With cattle susceptibility to the attacks of flies is correlated with colour, as is the liability to be poisoned by certain plants; so that even colour would be thus subjected to the action of natural selection.
|
|
|
and
a climber. The naked skin on the head of a vulture is generally
as a direct adaptation for wallowing in putridity; and so it may be, or it may possibly be due to the direct action of putrid matter; but we should be very cautious in drawing any such inference, when we see that the skin on the head of the clean-feeding male
is likewise naked. The sutures in the skulls of young mammals have been advanced as a beautiful adaptation for aiding parturition, and no doubt they facilitate, or may be indispensable for this act; but as sutures occur in the skulls of young birds and reptiles, which have only to escape from a broken egg, we may infer that this structure has arisen from the laws of growth, and has been taken advantage of in the parturition of the higher animals. |
|
| We are profoundly ignorant of the
→of each slight variation or individual difference;
and we are
made conscious of this by reflecting on the differences
the breeds of our domesticated animals in different
especially in the less
countries where there has been but little
selection. ↑
are
|
