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This makes me admire at those who affirm the air to be cold because it is dark and obscure, unless it be because they find others affirming it to be hot because it is light. For dark is not so proper and familiar to cold, as heavy and stable; for many things that are void of heat partake of splendor and light, but there is nothing cold that is light, nimble, or apt to ascend upward. Even the clouds themselves, while they preserve the nature of air, tower aloft in the sky; but changing into moisture, they presently fall down, and having admitted coldness, they lose their lightness as well as their heat. And so on the other side, having regained their heat, they again return to motion, their substance being carried upward as soon as it is changed into air.
