It is observed that pearls are always the most beautiful in those places of the sea where a quantity of fresh water falls. Thus in the Red Sea they were always most esteemed that were fished from Suakem southward, that is in those parts corresponding to the country anciently called Berberia, and Azamia, from reasons before given; on the Arabian coast, near the island Camaran, where there is abundance of fresh water; and the island of Foosht, laid down in my map, where there are springs; there I purchased one I had the pleasure to see taken out of the shell. It has been said that the fish of these shells are good, which is an error; they were the only shell-fish in the Red Sea I found not eatable. I never saw any pearl shells on either side southward of the parallel of Mocha in Arabia Felix. As it is a fish that delights in repose, I imagine it avoids this part of the gulf, as lying open to the Indian Ocean, and agitated by variable winds. In that part of my narrative where I speak of my return through the Desert of Nubia, and the shells found there, I have likewise mentioned the mussel found in the salt springs that appear in various parts of that desert. These likewise travel far from home, and are sometimes surprised by the ceasing of the rains, at a greater distance from their beds than they have strength and moisture to carry them. In many of these shells I have found those kind of excrescences which we may call Pearls, all of them ill-formed, foul, and of a bad colour, but of the same consistence, and lodged in the same part of the body as those in the sea. The mussel, too, is in every respect similar, I think larger, the outer skin or covering of it is of a vivid green. Upon removing this, which is the epidermis, what next appears is a beautiful pink, without gloss, and seemingly of a calcareous nature. Below this, the mother-of-pearl, which is undermost, is a white without lustre, partaking much of the blue, and very little of the red, and this is all the difference I observed between it and the pearl-bearing mussel in the Red Sea; but even this latter I always found in still water, soft bottom, and far from stony or rocky ground. None of these pearl mussels, either in the Red Sea or the desert, have any appearance of being spinners, as they are generally described to be.