The Circular Motion of the Heavens and the Moon

Once water is generated from air, and air from water, why are clouds not formed in the upper air? They ought to form there the more, the further from the earth and the colder that region is. For it is neither appreciably near to the heat of the stars, nor to the rays reflected from the earth. It is nears that dissolve any formation by their heat, and so prevent clouds from forming near the earth. But if the whole of that vast region is vapor, the amount of air and of water will be disproportionately cranked. This cannot be fire, for then all the rest would have been dried up. Consequently what fills it must be air into the water that surrounds