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3The species of sponge-stone, however, thence obtained, is not found except in the neighbourhood of Ætna and the hills of Mysia, which the Greeks call κατακεκαυμένοι, and places of such description. If, therefore, in these places hot springs and heated vapours are found in the cavities of the mountains, and the spots are recorded by the antients to have been subject to fires issuing out of the lands, it seems certain that the moisture is extracted from the sand-stone and earth in their neighbourhood, by the strength of the fire, as from lime-stone in a kiln.
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