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For the variety of taste in water there are four causes. The first is the kind of soil through which it flows. The second also depends on the soil when the water arises from transmutation of it. The third is from air which has been transformed into water. The fourth comes from some taint which water often contracts when injuriously affected by foreign bodies. These causes impart to water, first, variety of taste, then medicinal power, its heavy pestilential smell, its lightness and heaviness, its heat and its excessive astringency. It is affected by its passage through ground full of sulphur, or nitre (= saltpetre), or bitumen. If the water is tainted in this way, the drinking of it endangers life. This is the explanation of a passage in Ovid:
The Ciconians have a river a draught of whose waters turns into stone.
The bowels; which mantles in marble all that it touches.
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The river in question has medicinal properties, its mud being of the kind that glues together and hardens the bodies it encounters. Just as the dust at Puteoli becomes stone if it touches water, so, contrariwise, if the water of this river touches a solid body, it adheres and gets firmly affixed to it. This is the reason why objects thrown into the same lake57 are constantly found to be turned to stone when they are taken out. This occurs at several places in Italy; you may put into the water a twig or bough and a few days after you can take out a stone. The mud surrounds the object and gradually coats it over. This will seem the less surprising if you have remarked that the Albula, and, generally speaking, all water charged with sulphur, deposit a coating of it on the banks of their channels and streams. Some one or other of the foregoing causes accounts for the peculiarities of those lakes, whereof who tastes with the lips, in the words of the same poet,
Goes raving mad or endures a sleep of wondrous depth.
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The effect is like that of strong drink, only more violent. Drunkenness is madness until its effects pass off; with a weight like lead it bears down its victim into sleep. In the like manner the strong infusion of sulphur in this water contains a sort of poison that is more potent owing to the noxious atmosphere, and either goads the mind to madness or weighs it down in deep sleep. The river in Lyncestis likewise possesses this baleful power:
For whoso with intemperate lips has drained a draught,
Staggers as if having drunk deep of wine undiluted.