CHAP. 15.—SALT AND BITTER WATERS.
Juba says, that in the country of the Troglodytæ there is a
lake, called the "Lake of Insanity," [Note] from its highly noxious
properties: thrice a day it becomes salt and bitter, and then
again fresh, the same taking place as many times during the
night. It is full, he says, of white serpents, twenty cubits
long. [Note] He mentions, also, a certain spring in Arabia, which
rises from the ground with such remarkable force, as to throw
back any object pressed down upon it, however weighty.
