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 generally recognised that the waters of lakes which have no outlet ultimately become more or less saline. Of these the most important in the old world are the Caspian, the Sea of Aral, Lakes Balkash, Van, Urumiah, and, lastly, the Dead Sea, or as it was originally called, "the Salt Sea." "The Caspian," says Professor Hull, "owing to its great extent and other causes, is but slightly saline; but that with which we have here to deal is the most saline of all. It is probable that the water of the ocean itself has become salt owing to the same cause which has produced saltness in the inland lakes, as it may be regarded as a mass of water without an outlet. The cause of the saltness in such lakes I now proceed to explain.

"It has been found that the waters of rivers contain, besides matter which is in a state of mechanical suspension, carbonates of lime and magnesia, and saline ingredients in a state of solution; and as those lakes which have an outlet, such as the Sea of Galilee, part with their waters and saline ingredients as fast as they receive them, the waters of such lakes remain fresh. It is otherwise, however, with regard to lakes which have no outlet. In such cases the water is evaporated as fast as it is received; and as the vapour is in a condition of purity, the saline ingredients remain behind. Thus the waters of such a lake tend constantly to increase in saltness, until a state of saturation is attained, when the excess of salt is precipitated, and forms beds at the bottom of the lake. The contrast presented by the waters of the Sea of Galilee on the one hand, and those of the Dead Sea on the other, though both are fed by the same river, is a striking illustration of the effects resulting from opposite physical conditions. In the former case, the waters are fresh, and abound in fishes and molluscs; in the latter, they are so intensely salt that all animal life is absent.

"The increase of saltness in the waters of the Dead Sea