On Architecture

19. On the same principle, copper, which is naturally more solid, will disperse and turn into verdigris if similarly treated. So, also, a pearl. Even rocks of lava, which neither iron nor fire alone can dissolve, split into pieces and dissolve when heated with fire and then sprinkled with vinegar. Hence, since we see these things taking place before our very eyes, we can infer that on the same principle even patients with the stone may, in the nature of things, be cured in like manner by means of acid waters, on account of the sharpness of the potion.

20. Then there are springs in which wine seems to be mingled, like the one in Paphlagonia, the water of which intoxicates those who drink of the spring alone without wine. The Aequians in Italy and the tribe of the Medulli in the Alps have a kind of water which causes swellings in the throats of those who drink it.

21. In Arcadia is the well-known town of Clitor, in whose territory is a cave with running water which makes people who drink of it abstemious. At this spring, there is an epigram in Greek verses inscribed on stone to the effect that the water is unsuitable for bathing, and also injurious to vines, because it was at this spring that Melampus cleansed the daughters of Proetus of their madness by sacrificial rites, and restored those maidens to their former sound state of mind. The inscription runs as written below:

1. Swain, if by noontide thirst thou art opprest
2. When with thy flocks to Cleitor's bounds thou'st hied,
3. Take from this fount a draught, and grant a rest
4. To all thy goats the water nymphs beside.
5. But bathe not in't when full of drunken cheer,
6. Lest the mere vapour may bring thee to bane;
7. Shun my vine-hating spring—Melampus here
8. From madness once washed Proetus' daughters sane,
9. And all th' offscouring here did hide, when they
10. From Argos came to rugged Arcady.