has traversed all the territories of Africa in their utmost extent, the heat is rendered almost insupportable. If we take all that district of Africa comprised between the Tropics, where the east wind blows most constantly, we shall easily conceive that the western coasts of this part of the world must, and actually do, experience a greater degree of heat than those of the eastern coasts; as the east wind reaches the latter with the freshness which it receives in passing over a vast sea, whereas before it reaches the former, it acquires a burning heat, in traversing the interior parts of Africa. Thus, therefore, the coasts of Senegal, Sierra Leona, Guinea, and all the western regions of Africa, situated under the Torrid Zone, are the hottest climates in the world; nor is it by any means so hot on the eastern coasts, at Mosambique, Mombaza, &c. I have not the smallest doubt, therefore, but this is the reason that we find the real negroes, or the blackest men, in the western territories of Africa, and Caffres, or black men, of a hue more light, in the eastern territories. The evident difference which subsists between these two species of blacks proceeds from the heat of their climate, which is not very great in the eastern, but excessive in the western. Beyond the Tropic, on the south, the heat is considerably diminished, not only from its situation as to climate, but from the point of Africa being contracted; and as that point is surrounded by the sea the air is necessarily more temperate than it could be in the middle of a continent. The colour of the inhabitants of this country begins to assume a fairer hue, and they are naturally more white than black. Nothing affords a more convincing proof that the climate is the principal cause of the variety in the human species than the colour of the Hottentots, who could not possibly be found less black did they not enjoy a more temperate climate.