Their arguments, indeed, are in direct contradiction to the most obvious facts. Thus they allege, although the most ordinary observation shows the contrary, that climate _has_ produced alterations in the Jewish type, inasmuch as many light-haired, blue-eyed Jews are found in Germany. For this argument to be of any weight in their position, the advocates for unity of race must recognize climate to be the sole, or at least principal, cause of this phenomenon. But the adherents of that doctrine elsewhere assert that the color of the eyes, hair, and skin, no ways depends upon geographical situation or the action of heat and cold.[150] As an evidence of this, they justly cite the Cinghalese, who have blue eyes and light hair;[151] they even observe among them a very considerable difference of complexion, varying from a light brown to black. Again, they admit that the Samoiedes and Tungusians, though living on the borders of the Frozen Ocean,[152] have an exceedingly swarthy complexion. If, therefore, climate exerts no influence upon the complexion and color of hair and eyes, these marks must be considered as of no importance, or as pertaining to race. We know that red hair is not at all uncommon in the East, and at no time has been so; it cannot, therefore, create much surprise if we occasionally find it among the Jews of Germany. This fact cannot be adduced as evidence either in favor of, or against, the permanence of types. The advocates for unity are no less unfortunate in their historical arguments. They furnish but two; the Turks and the Magyars. The Asiatic origin of the former is supposed to be established beyond doubt, as well as of their intimate relationship with the Finnic branches of the Laplanders and Ostiacs. It follows from this that they must originally have displayed the yellow skin, projecting cheek bones, and low stature of the Mongolian races. This point being settled, we are told to look at the Turks of our day, who exhibit all the characteristics of the European type. Types, then, are not permanent, it is victoriously concluded, because the Turks have undergone such a transformation. "It is true," say the adherents of the unity school, "that some pretend there had been an admixture of Greek, Georgian, and Circassian blood. But this admixture can have taken place only to a very limited extent; all Turks are not rich enough to buy their wives in the Caucasus, or to have seraglios filled with white slaves; on the other hand, the hatred which the Greeks cherish for their conquerors, and the religious antipathies of both nations, were not favorable to alliances between them, and consequently we see them--though inhabiting the same country--as distinct at this day as at the time of the conquest."[153]