also very much resemble in form; and the sand which is brought up contains gold. To obtain this sand the Indians make expeditions into the desert, each one having yoked together three camels, placing a female in the middle and a male like a trace-horse to draw by each side. On this female he mounts himself, having arranged carefully that she shall be taken to be yoked from young ones, the more lately born the better. For their female camels are not inferior to horses in speed, and moreover they are much more capable of bearing weights. 103. As to the form of the camel, I do not here describe it, since the Hellenes for whom I write are already acquainted with it, but I shall tell that which is not commonly known about it, which is this:⁠—the camel has in the hind legs four thighs and four knees, 497 and its organs of generation are between the hind legs, turned towards the tail. 104.