Poseidonius besides asserts that the eastern parts are moist, because the sun quickly changes its place after rising; and that the western parts are dry, because the sun there turns in his course. Now, drought and moisture depend upon the abundance or scarcity of water, and on the presence or absence of the sun’s rays. But Poseidonius means to speak of the effects produced by the sun, which all writers determine by the latitude, north or south; but east and west, as applied to the residence of men, differ in different places, according to the position of each inhabited spot and the change of horizon; so that it cannot be asserted generally of places indefinite in number, that those lying to the east are moist, and those to the west dry: but as applied to the whole earth and such extremes of it as India and Spain, his expressions (east and west) may be just; yet what truth or probability is there in his (attempted) explanation (of the causes of drought and moisture)? for in the continuous and unceasing circuit of the sun, what turn can there be in his course? The rapidity too of his passage through every part is equal. Besides, it is contrary to evidence to say, that the extreme parts of Spain or Mauretania towards the west are drier than all other places, when at the same time they are situated in a temperate climate and have water in great abundance. But if we are to understand the turning of the sun in this way, that there at the extremities of the habitable world he is above the earth, how does that tend to produce drought? for there, and in other places situated in the same latitude, he leaves them for an equal portion of the night and returns again and warms the earth. 11. Somewhere there, also, are copper mines; and a spring of asphaltus; scorpions of enormous size,[958] both with and without wings, are said to be found there, as well as tarantulas, remarkable for their size and numbers. Lizards also are mentioned of two cubits in length. At the base of the mountains precious stones are said to be found, as those called the Lychnitis (the ruby) and the Carchedonius (the carbuncle?). In the plains are found great quantities of oyster and mussel shells, similar to those mentioned in our description of Ammon. There is also a tree called melilotus, from which a wine is made. Some obtain two crops from the ground and have two harvests, one in the spring, the other in the summer. The straw is five cubits in height, and of the thickness of the little finger; the produce is 250-fold. They do not sow in the spring, but bush-harrow the ground with bundles of the paliurus, and find the seed-grain sufficient which falls from [CAS. 831] the sheaves during harvest to produce the summer crop. In consequence of the number of reptiles, they work with coverings on the legs; other parts of the body also are protected by skins.