Southern India, like Arabia and Ethiopia, produces cinnamon, nard, and other aromatics. It resembles these countries as regards the effect of the sun’s rays, but it surpasses them in having a copious supply of water, whence the atmosphere is humid, and on this account more conducive to fertility and fecundity; and this applies to the earth and to the water, hence those animals which inhabit both one and the other are of a larger size than are found in other countries. The Nile contributes to fecundity more than other rivers, and among other animals of large bulk, produces the amphibious kind. The Egyptian women also sometimes have four children at a birth, and Aristotle says that one woman had seven children at one birth.[353] He calls the Nile most fecundating and nutritive, on account of the moderate coction effected by the sun’s rays, which leave behind the nutritious part of substances, and evaporate that which is superfluous.
23. It is perhaps owing to this cause that the water of the Nile boils, as he says, with one half of the heat which other water requires. In proportion however, he says, as the water of the Nile traverses in a straight line, a long and narrow tract of country, passing through a variety of climates and of atmosphere, while the Indian rivers are poured forth into wider and more extensive plains, their course being delayed a long time in the same climate, in the same degree the waters of India are more nutritious than those of the Nile; they produce larger animals of the cetaceous kind, and in greater number (than the Nile), and the water which descends from the clouds has already undergone the process of coction.
24. This would not be admitted by the followers of Aristobulus, who say that the plains are not watered by rain. Onesicritus, however, thinks that rain-water is the cause of the peculiar properties of animals, and alleges in proof, that the colour of foreign herds which drink of it is changed to that of the native animals.
This is a just remark; but it is not proper to attribute to the power of the water merely the cause of the black complexion and the woolly hair of the Ethiopians, and yet he censures Theodectes, who refers these peculiarities to the effects of the sun, in these words,
“Near these approaching with his radiant car,
The sun their skins with dusky tint doth dye,
And sooty hue; and with unvarying forms
Of fire, crisps their tufted hair.”
There may be reason in this, for he says that the sun does not approach nearer to the Ethiopians than to other nations, but shines more perpendicularly, and that on this account the heat is greater; indeed, it cannot be correctly said that the sun approaches near to the Ethiopians, for he is at an equal distance from all nations. Nor is the heat the cause of the black complexion, particularly of children in the womb, who are out of the reach of the sun. Their opinion is to be preferred, who attribute these effects to the sun and to intense solar heat, causing a great deficiency of moisture on the surface of the skin. Hence we say it is that the Indians have not woolly hair, nor is their colour so intensely[354] dark, because they live in a humid atmosphere.
With respect to children in the womb, they resemble their parents (in colour) according to a seminal disposition and constitution, on the same principle that hereditary diseases, and other likenesses, are explained.