There are, moreover, certain peculiarities in certain places. In Africa dew falls during the night in summer. In Italy, at Locri, and at the Lake Velinum, there is never a day in which a rainbow is not seen[1]. At Rhodes and at Syracuse the sky is never so covered with clouds, but that the sun is visible at one time or another; these things, however, will be better detailed in their proper place. So far respecting the air.