CHAP. 17.—WATERS WHICH PRESERVE THEIR WARMTH FOR THREE
At Crannon1 there are certain hot springs, though not at
boiling heat, the water of which, mixed with wine, preserves
it warm in the vessels for a period of three days. The same is
the case, too, with the springs of Mattiacum2 in Germany,
beyond the river Rhenus, the water of which retains its boiling heat three days. The margin of these springs is covered
with pumice, formed by the action of the water.
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