Its place is in the air. For place is the circumference of a body. But what is it that surrounds bodies but air? There are, moreover, different places in which the movement of air originates, and from these the winds get their names. There are in all twelve winds. It is said that air is just fire after it has been extinguished, or the vapour of heated water. At all events, in its own special nature the air is warm, but it becomes cold owing to the proximity of water and earth, so that the lower parts of it are cold, and the higher warm Nemes., De Nat. Hom. i., ch. 5..