to continue for ever, the head and legs of these sheep would never be so small as the head and legs of a rat.
It cannot be true, therefore, that among animals, some of the offspring will possess the desirable qualities of the parents in a greater degree; or that animals are indefinitely perfectible.
The progress of a wild plant to a beautiful garden flower, is perhaps more marked and striking, than anything that takes place among animals, yet even here, it would be the height of absurdity to assert, that the progress was unlimited or indefinite.
One of the most obvious features of the improvement is the increase of size. The flower has grown gradually larger by cultivation. If the progress were really unlimited it might be increased ad infinitum; but
