During the winter, the rain loosens the blocks and causes crevices to form in the mass of salt rock. The Arabs go there in the spring and break away these blocks by the aid of iron bars; then they knock them to pieces with large hammers, and thus get them into proper shape for transportation. For thousands of years, they have thus been at work on this mountain, taking all they want, but the supply is not by any means exhausted. The quarries are not constantly worked, as the demand for the salt is not very great. The mountain is so far from the coast that it does not pay to carry the salt there, and consequently the demand is purely local. There is a similar mountain, though much smaller, some distance away to the west. It is more curious in some respects, there being a stream of water which passes it, and has worn a great many pits, caverns, and cavities in the mass of salt. Before reaching the rock, the stream is perfectly fresh, but very soon it becomes impregnated with salt. The stalactites and pillars are very curious in their formation, and when the sun shines upon them they sparkle like great masses of diamonds. In some places, the crystals of salt jut over the edge of the little stream, and occasionally they fall just a little short of forming an arch. [Sidenote: THE FRENCH SUPPLY THE DESERT WITH WATER.] In the desert proper, the French have done something to advance growth by boring Artesian wells. The great need of the desert is water, and many thousands of square miles of land, on which there is not a blade of grass or plant, might be rendered fertile if any means could be devised to supply them with water. The French have given a great deal of study to this subject, but as none of them are possessed of the power of Moses to bring water from a rock where apparently none existed, they have not yet covered the desert with palm trees and wheat fields. The palm tree must have water to keep it alive. The Arabs say it lives with its head in the fire and its foot in the water; it seems to be happy with the burning sun of the desert, and not even the hottest rays which the heavens can pour down can disturb it in the least so long as its foot is properly bathed. Take away its supply of water, and it dies in a short time. It must be watered twice a week; there is generally a ditch around the foot of the tree, and this ditch is filled either from a canal or with water carried in buckets or skins. About a barrel full of the liquid is needed for each tree. It will thus be seen that the limit of a palm oasis in the desert may be sometimes determined by the water supply. I have seen thousands of acres of desert land, possessing no value whatever, which would have been far different had there been a running and reliable stream or spring in their vicinity.