Thus, for instance, the first wanderers to the South and East would, in time, become the black Papuan races; and others, passing through Suez and Egypt into Africa Proper—so to term it—would become baked and brutified by the sun and the sandy wilderness. On the other hand, they who moved through the temperate zone under beneficent firmaments, and in Mesopotamian districts, would naturally become the Assyrian, Persian, Pelasgian builders of houses, ships, temples, great cities, and historical colonies. The tribes migrating up toward the North would, from the first, suffer from the Boreal elements, and take deep traces of them; but would also be endowed with great physical energy from the same, and under the Mongolian name, agitate all the North with powerful migrations, and, in the end, originate those world-overthrowing hordes, which filled subsequent ages with so much terror and glory. The earlier wanderers into Africa, passing inward and southward, would give rise to those marked and many-named tribes, classed under the nomenclature of Negroes. The hot sun, and the condition of their soil, would affect their physical nature. Every thing would tend, as we have still the opportunity of perceiving, to degrade the human type in the interior of Africa. The people would become mere animals without the stimulants of happier localities. They would bask lazily in the sun, crowd together in kraals, and propagate their degraded race into something still more stupid and degraded by the vitiating closeness of their intermarriages. In such circumstances of savagery, the dropping and thickness of the sensual mouth, and the other facial peculiarities would grow and become hardened features, in the course of time. It seems to be generally understood that the power of adaptation is a law of physical nature, as well in man as in the lower organizations; and it may very reasonably be concluded that the human head is modified by the powers of the brain—the energy of thought expanding the capacity of the head. This is the opinion of Mallebranche, and other philosophers and physiologists. We may conclude that the sensual stagnation of the intellectual faculties, under the tropical elements, where exertion of any kind could have but little effect in bettering the condition of a lazy population, leaves the brain to grow feeble and flaccid from disuse; whence it is not unphilosophical to conclude the fore part of the head would sink in, and lie toward the back. It seems to be a general physical law, that the expression of the face shall indicate the natures of men. The Arabs and other Asiatics arriving from the East into Egypt, and bringing on their firm faces the traces of their arduous circumstances and active habits, came, in the course of generations, to be marked with the sensuousness of mouth and chin, and the lower arch of the head which distinguish the Egyptian face. The hot and enervating climate of Egypt had a