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Before a variety can become permanent, it must be either separated from the others or have acquired some disinclination or inability to interbreed with them.

Moreover, the fact that dogs show little or no tendency to revert to the form and habits of their brutal kindred, or to interbreed with them, is clearly against the supposition that there is any close relation between the creatures.

The Bontoc hog is bred, born, and raised in a secure pen, yet wild blood is infused direct, since pigs are frequently purchased by Bontoc from surrounding pueblos, most of whose hogs run half wild and intermingle with the wild ones of the mountains. That the domestic hog in some places in northern Luzon does thus interbreed with the wild ones is a proved fact.

Moses wrote the rigid unchanging law of nature, when he said that every living creature would bring forth "after its kind." Species are immutable. One does not become another, or unite with another to produce a third. Dogs do not become cats, nor interbreed to produce another species.

In an open country where animals and plants interbreed freely, it will commonly happen that individuals with certain peculiarities will mate with others without such peculiarities, and the offspring will therefore inherit the peculiarity not in increased degree but in decreased degree.

As long as varieties interbreed together and with the parent form, it does not seem possible that a new species could be formed by natural selection, excepting in cases of geographical isolation. All the individuals might vary in some one direction, but they could not split up into distinct species whilst they occupied the same area and interbred without difficulty.

This down, which combines warmth and lightness, gives a high market value to the eider, which, throughout Scandinavian countries is strictly protected by law and even more effectually by public opinion. The majority of ornamental ducks interbreed freely in captivity.

The result justified their sagacious anticipations, and coincided very nearly with what occurred to the progeny of Gratio Kelleia. The young lambs were almost always either pure Ancons, or pure ordinary sheep. But when sufficient Ancon sheep were obtained to interbreed with one another, it was found that the offspring was always pure Ancon.

Man isolates varieties, and breeds from them, and continuing to separate those that vary in the direction he wishes to follow, a very great difference is, in a comparatively short time, produced. But these artificial varieties, though often more different from each other than some natural species, readily interbreed, and if left to themselves rapidly revert to a common type.

The result justified their sagacious anticipations, and coincided very nearly with what occurred to the progeny of Gratio Kelleia. The young lambs were almost always either pure Ancons, or pure ordinary sheep. But when sufficient Ancon sheep were obtained to interbreed with one another, it was found that the offspring was always pure Ancon.