(M. Flourens might have added that the mummies of the white and black races show them to have been as distinct then as now, and that the monumental drawings represent the different races more than a thousand years further back.)
"Thus, then, through three thousand years, no species has changed. An experiment which continues through three thousand years, is not an experiment to be made—it is an experiment made. Species do not change."[208]
Permanence of type, then, is the only test which he can adduce for the designation of species, and he here comes back plainly to the position we have taken. Let us now test the races of men by this rule. The white Asiatic races, the Jew, the Arab, the Egyptian, the negro, at least, are distinctly figured on the monuments of Egypt and Assyria, as distinct as they are now, and time and change of climate have not transformed any one type into another. In whatever unexplored regions of the earth the earliest voyagers have gone, they have found races equally well marked. These races are all prolific inter se, and there is every reason to believe that we here find the fourth and last degree of hybridity. Whether the prolificacy is unlimited between all the races or species of men is still an unsettled point, and experiments have not yet been fully and fairly made to determine the question. The dog and wolf become sterile at the third. The dog and jackal at the fourth generation, and who can tell whether the law of hybridity might not show itself in man, after a longer succession of generations. There are no observations yet of this kind in the human family. It is a common belief in our Southern States, that mulattoes are less prolific, and attain a less longevity than the parent stocks. I am convinced of the truth of this remark, when applied to the mulatto from the strictly white and black races, and I am equally convinced, from long personal observation, that the dark-skinned European races, as Spaniards, Portuguese, Italians, Basques, &c., mingle much more perfectly with the negroes than do fair races, thus carrying out the law of gradation in hybridity. If the mulattoes of New Orleans and Mobile be compared with those of the Atlantic States, the fact will become apparent.
The argument in favor of unlimited prolificacy between species may be strongly corroborated by an appeal to the history of our domestic animals, whose history is involved in the same impenetrable mystery as that of man. M. Geoffroy St. Hilaire very justly remarks that we know nothing of the origin of our domestic animals; because we find wild hogs, goats, sheep, &c., in certain parts of Europe, several thousand years subsequent to the early migrations of man, this does not prove that the domestic come from these wild ones. The reverse may be the case.[209]
We have already made some general observations on the genus canis, whose natural history is most closely allied to that of man. Let us now inquire whether the domestic dog is but one species, or whether under this head have been included many proximate species of unlimited prolificacy. If we try the question by permanency of type, like the races of men, and all well-marked species, the doubt must be yielded.
There are strong reasons given by Dr. Morton and other naturalists, for supposing that our common dogs, independent of mixtures of their various races, may also have an infusion of the blood of foxes, wolves, jackals, and even the hyena; thus forming, as we see every day around us, curs of every possible grade; but setting aside all this, we have abundant evidence to show that each zoological province has its original dog, and, perhaps, not unfrequently several.
In one chapter on hybridity in the "Types of Mankind," it is shown that our Indian dogs in America present several well-marked types, unlike any in the Old World, and which are indigenous to the soil. For example, the Esquimaux dog, the Hare Indian dog, the North American dog, and several others. We have not space here to enter fully into the facts, but they will be found at length in the work above mentioned. These dogs, too, are clearly traced to wild species of this continent.
In other parts of the world we find other species equally well marked, but we shall content ourselves with the facts drawn from the ancient monuments of Egypt. It is no longer a matter of dispute that as far back, at least, as the twelfth dynasty, about 2300 years before Christ, we find the common small dog of Egypt, the greyhound, the staghound, the turnspit, and several other types which do not correspond with any dogs that can now be identified.[210] We find, also, the mastiff admirably portrayed on the monuments of Babylon, which dog was first brought from the East to Greece by Alexander the Great, 300 years B. C. The museums of natural history, also, everywhere abound in the remains of fossil dogs, which long antedate all living species.
The wolf, jackal, and hyena are also found distinctly drawn on the early monuments of Egypt, and a greyhound, exactly like the English greyhound, with semi-pendent ears, is seen on a statue in the Vatican, at Rome. It is clear, then, that the leading types of dogs of the present day (and probably all) existed more than four thousand years ago, and it is equally certain that the type of a dog, when kept pure, will endure in opposite climates for ages. Our staghounds, greyhounds, mastiffs, turnspits, pointers, terriers, &c., are bred for centuries, not only in Egypt and Europe without losing their types, but in any climate which does not destroy them. No one denies that climate influences these animals greatly, but the greyhound, staghound, or bulldog can never be transformed into each other.
The facts above stated cannot be questioned, and it is admitted that these species are all prolific without limit inter se.