On waves. Waves are of twelve kinds, of which: the first is made in the upper part of the water; the second is made above and below along one and the same course; the third is made above and below along contrary courses, and none in the middle; the fourth is made in such a way that from the middle upward it runs one way, and from that middle downward it is of opposite motion; the fifth runs below and not above; the sixth runs below, while above it stays in contrary motion; the seventh is that of the submersions of water by way of a vein that enters into the earth; the eighth is that of the submersions by way of eddies that go narrow above and wide below; the ninth, of eddies wide at the surface and narrow at the bottom; the tenth, of columnar eddies; the eleventh, of sinuous eddies of equal hollowness; the twelfth, of oblique eddies. — Make here all the waves together, and all [the...]