The Oasis of Ammon. The place where the temple of Ammon is located is entirely surrounded by a desert of far-stretching sand, which is destitute of water. The fertile spot in the midst of this desert, is not extensive; for where it stretches into its greater expanse, it is only about forty stades broad.368 It is full of cultivated trees, olives and palms; and it is the only place in those parts which is refreshed with dew. A spring also rises from it, quite unlike all the other springs which issue from the earth.369 For at midday the water is cold to the taste, and still more so to the touch, as cold as cold can be. But when the sun has sunk into the west, it gets warmer, and from the evening it keeps on growing warmer until midnight, when it reaches the warmest point. After midnight it goes on getting gradually colder; at daybreak it is already cold; but at midday it reaches the coldest point. Every day it undergoes these alternate changes............