The encampment thus established at En-gedi continued to be occupied as the head-quarters of our party for two or three weeks, during which time many expeditions were fitted out from it, for exploring the whole southern portion of the sea, and the country around. The engineer of the party measured a base line on the beach, and from the two stations at the extremities of it took the bearings of all the important points on the shores of the sea. He made the necessary astronomical observations also for determining the exact latitude and longitude of the camp. Parties were sent out, too, sometimes along the shores and up the mountains to collect plants and specimens, and at other times across to the eastern shore to measure the breadth of the sea, and to make soundings for determining the depth of it in every part. They preserved specimens and memorials of every thing. Even the mud and sand, and the cubical crystals of salt which their sounding apparatus brought up from the bottom of the sea, were put up in airtight vessels to be brought home for the inspection of naturalists and philosophers in America. Thus the whole party were constantly employed in the various labors incident to such an undertaking, meeting from time to time with strange and romantic adventures, and suffering on many occasions most excessively from exposure and fatigue. One of the most remarkable of the expeditions which they made from their camp at En-gedi, was a cruise of four days in the southern portion of the sea, in the course of which they circumnavigated the whole southern shore. In following down the western coast in first commencing their voyage, they found the scenery much the same as it had been in the northern part of the sea, the coast being formed of bald and barren mountains, desolate and gloomy, with a low, flat beach below, and sometimes a broad peninsula, or delta, formed, at the mouths of the ravines, by the detritus brought down from above. Farther south, however, the water became very shoal, so much so, that at last they could not approach the shore near enough to land, without wading for a great distance through water and mire. In fact, the line of demarkation between the land and the sea was often scarcely perceptible, the land consisting of low flats and slimy mud, coated with incrustations of salt, and sometimes with masses of drift-wood lying upon it, while the water was covered with a frothy scum, formed of salt and bitumen. Sometimes for miles the water was only one or two feet deep, and the men in such cases, leaving the boats, waded often to a great distance from them. Every night, of course, they stopped and encamped on the land. THE SIROCCO.