At Perperena,[1] there is a spring which petrifies[2] the ground wherever it flows, the same being the case also, with the hot waters at Ædepsus, in Eubœa; for there, wherever the stream falls, the rocks are continually increasing in height. At Eury- mente,[3] chaplets, when thrown into the waters of a certain fountain there, are turned to stone. At Colossæ there is a river, into the water of which if bricks[4] are thrown, when taken out they are found changed into stone. In the mines of Scyros, the trees petrify that are watered by the river, branches and all. In the caverns of Mount Corycus, the drops of water that trickle down the rocks become hard in the form of a stone.[5] At Mieza, too, in Macedonia, the water petrifies as it hangs from the vaulted roofs of the rocks; but at Corycus it is only when it has fallen that it becomes hard.

In other caverns, again, the water petrifies both ways,[6] and so forms columns; as we find the case in a vast grotto at Phlan- sia, a town of the Chersonesus[7] of the Rhodians, the columns of which are tinted with various colours. These instances will suffice for the present.