The same reasoning is applied to horses, cattle, goats, sheep, &c., while many, if not most of the best naturalists of the day deny that we know anything of the origin of our domestic animals. Geoffroy St. Hilaire, in his work, just out, denies it in toto. We are, however, for the sake of argument, willing to admit all the examples, and all he claims with regard to the origin of endless varieties in domesticated animals.[201]
Let us, on the other hand, "invite the advocates of unity of the human species" to say when and where such varieties have sprung up in the human family. We not only have the written history of man for 2000 years, but his monumental history for 2000 more; and yet, while the naturalists of Germany are catching wild hogs, and recording in a thousand instances "after a few generations" these wonderful changes, no one has yet pointed out anything analogous in the human family; the porcupine family in England, a few spotted Mexicans, &c., do not meet the case; history records the origin of no permanent variety. No race of men has in the same country turned black, brown, gray, white, and spotted. The negroes in America have not in ten generations turned to all colors, though fully domesticated, like pigs and turkeys. The Jews in all countries for 2000 years are still Jews. The gypsies are everywhere still gypsies. In India, the different castes, of different colors, have been living together several thousand years, and are still distinct, &c. &c.
Nor does domestication affect all animals and fowls equally; compare the camel, ass, and deer, with the hog and dog; the Guinea fowl, pea fowl, and goose, with pigeons, turkeys, and common fowls. In fact, no one animal can be taken as an analogue for another: each has its own physiological laws; each is influenced differently and in different degrees by the same external influences. How, then, can an animal be taken as an analogue for man?
We have also abundant authority to show that all wild species do not present the same uniformity in external characters.
"All packs of American wolves usually consist of various shades of color, and varieties nearly black have been occasionally found in every part of the United States.... In a gang of wolves which existed in Colleton District, South Carolina, a few years ago (sixteen of which were killed by hunters in eighteen months), we were informed that about one-fifth were black, and the others of every shade of color, from black to dusky gray and yellowish white."—Audubon & Bachman, 2d Amer. ed., vol. ii. pp. 130-1.
Speaking of the white American wolf, the same authors say:—
"Their gait and movements are precisely the same as those of the common dog, and their mode of copulating and number of young brought forth at a litter, are about the same." (It might have been added that their number of bones, teeth, whole anatomical structure are the same.) "The diversity of their size and color is remarkable, no two being quite alike."... "The wolves of the prairies ... produce from six to eleven at a birth, of which there are very seldom two alike in color."—Op. cit., p. 159.
"The common American wolf, Richardson observes, sometimes shows remarkable diversity of color. On the banks of the Mackenzie River I saw five young wolves leaping and tumbling over each other with all the playfulness of the puppies of the domestic dog, and it is not improbable they were all of one litter. One of them was pied, another black, and the rest showed the colors of the common gray wolves."
The same diversity is seen in the prairie wolf, and naturalists have been much embarrassed in classifying the various wolves on account of colors, size, &c.
All this is independent of domestication, and shows the uncertainty of analogues; and still it is remarkable that though considerable variety exists in the native dogs of America in color and size, they do not run into the thousand grotesque forms seen on the old continent, where a much greater mixture exists. The dogs of America, like the aboriginal races of men, are comparatively uniform. In the East, where various races have come together, the men, like the dogs, present endless varieties, Egypt, Assyria, India, &c.
Let us suppose that one variety of hog had been discovered in Africa, one in Asia, one in Europe, one in Australia, another in America, as well marked as those Dr. B. describes; that these varieties had been transferred to other climates as have been Jews, gypsies, negroes, &c., and had remained for ages without change of form or color, would they be considered as distinct species or not?—can any one doubt? The rule must work both ways, or the argument falls to the ground.