This is the process of artificial selection as carried on by man.
If art by artificial selection, why not Nature by natural selection?
Artificial selection begins with the domestication of animals.
Moreover, their stock was actually strengthened by artificial selection.
Thus, by a simple method of artificial selection, the silkworm industry has been rescued from what threatened to be a collapse.
But this would mean a return to artificial selection in its most primitive and sanguinary form.
To artificial selection we chiefly owe all the many races or varieties of our domesticated animals and plants.
A similar explanation of types may be given regarding animals modified by artificial selection.
But as artificial selection has lengthened the wings in some instances, why may it not have shortened them in others?
Artificial selection appears to enlarge or diminish used parts or disused parts with equal facility.