As we had concluded, that where there were hills there would be springs, so it happened; but we were not only surprised, but really frighted, to find the first spring we came to, and which looked admirably clear and beautiful, to be salt as brine. It was a terrible disappointment to us, and put us under melancholy apprehensions at first; but the gunner, who was of a spirit never discouraged, told us we should not be disturbed at that, but be very thankful, for salt was a bait we stood in as much need of as anything, and there was no question but we should find fresh water as well as salt; and here our surgeon stepped in to encourage us, and told us that if we did not know he would show us a way how to make that salt water fresh, which indeed made us all more cheerful, though we wondered what he meant. Meantime our men, without bidding, had been seeking about for other springs, and found several; but still they were all salt; from whence we concluded that there was a salt rock or mineral stone in those mountains, and perhaps they might be all of such a substance; but still I wondered by what witchcraft it was that our artist the surgeon would make this salt water turn fresh, and I longed to see the experiment, which was indeed a very odd one; but he went to work with as much assurance as if he had tried it on the very spot before. He took two of our large mats and sewed them together, and they made a kind of a bag four feet broad, three feet and a half high, and about a foot and a half thick when it was full. He caused us to fill this bag with dry sand and tread it down as close as we could, not to burst the mats. When thus the bag was full within a foot, he sought some other earth and filled up the rest with it, and still trod all in as hard as he could. When he had done, he made a hole in the upper earth about as broad as the crown of a large hat, or something bigger about, but not so deep, and bade a negro fill it with water, and still as it shrunk away to fill it again, and keep it full. The bag he had placed at first across two pieces of wood, about a foot from the ground; and under it he ordered some of our skins to be spread that would hold water. In about an hour, and not sooner, the water began to come dropping through the bottom of the bag, and, to our great surprise, was perfectly fresh and sweet, and this continued for several hours; but in the end the water began to be a little brackish. When we told him that, "Well, then," said he, "turn the sand out, and fill it again." Whether he did this by way of experiment from his own fancy, or whether he had seen it done before, I do not remember.