Thus one of them says, "The water of the Lake is purity itself, but on account of the highly rarified state of the air it is not very buoyant, and swimmers find some little fatigue; or, in other words, they are compelled to keep swimming all the time they are in the water; and objects which float easily in other water sink here like lead." Again he says, "Not a thing ever floats on the surface of this Lake, save and except the boats which ply upon it." It is scarcely necessary to remark that it is impossible that the diminution of atmospheric pressure, due to an elevation of 6250 feet (1905 meters) above the sea-level, could sensibly affect the density of the water.

In fact, the coefficient of compressibility of this liquid is so small that the withdrawal of the above indicated amount of pressure (about one-fifth of an atmosphere) would not lower its density more than one hundred-thousandth part! The truth is, that the specific gravity is not lower than that of any other fresh water of equal purity and corresponding temperature.

It is not less buoyant nor more difficult to swim in than any other fresh water; and consequently the fact that the bodies of the drowned do not rise to the surface cannot be accounted for by ascribing marvelous properties to its waters.
The distribution of temperature with depth affords a natural and satisfactory explanation of the phenomenon, and renders entirely superfluous any assumption of extraordinary lightness in the water.

The true reason why the bodies of the drowned do not rise to the surface is evidently owing to the fact that when they sink into water which is only 4 deg.Cent.

(7.2 deg.