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3There are some hot springs from which water of an excellent flavour is procured, so pleasant to the taste, that it is inferior neither to that of the fountains of the Camænæ nor of the Martian aqueduct. These are naturally so, on the following account. When fire is generated under ground, and the soil is heated all round, either from abundance of alum, bitumen, or sulphur, the hot vapour ascends to the upper parts, and, if there are therein springs of sweet water affected by its spreading through the pores, they grow hot, without injury to the flavour.
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