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10In the same manner, at Hierapolis, in Phrygia, a large head of hot water boils up, and is conducted by ditches round the gardens and vineyards. At the end of a year the ditches become incrusted with stone; and hence, making yearly cuts to the right and left, they carry off the incrustations, and use them for building field walls. This circumstance, as it appears to me, would naturally happen, if, in these spots, and in the land about, there be a juice or moisture whose nature is similar to that of rennet. For then, when this coagulating power issues forth from the earth, through the springs, congelation takes place by the heat of the sun and air, as is seen in salt-pits.
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