Aristotle’s account. The properties of waters, their tastes, and all their other qualities arise, to sum the matter up, from three causes.976 Either they are due to differences in the earth (for each water takes on a taste corresponding to the kind of earth in which it lies and through which it flows: salty, alkaline, bitter, or any of the other tastes);977
2 · Exhalation and air
I.39.1.2 · Wachsmuth pp. 254
or they are due to the admixture of a smoky and fiery exhalation (for the admixture of what is hot and smoky produces petrification and the solidification of salts and alkalis, as well as heaviness and lightness, thickness and thinness, and the other properties); or they are due to the air.978
3 · Heat and the ground
I.39.1.3 · Wachsmuth pp. 254
Heat and cold also arise [indeed] from the earth, according to the kind through which the water flows and in which it ⟨may⟩ be.979 For burnt, dry, and bituminous earth makes waters warm;
4 · Springs and depths
I.39.1.4 · Wachsmuth pp. 254
whereas cold waters, speaking generally, ⟨are those in⟩ places with flowing springs; more particularly, those at a depth [as a general rule],980 such as those in mines (for they are far from the sun), unless the place is fiery (for the waters must be removed from sources of heat, both the heat in the air and that in the earth);981
5 · Height, shade, and wind
I.39.1.5 · Wachsmuth pp. 254
also those in high places, because of the winds and especially because of the coldness of the air; and ⟨those⟩ in deeply shaded and windy places (for they are cooled by both, which is also why some become warm when trees are cut down);982
6 · Air passages
I.39.1.6 · Wachsmuth pp. 254
also those with air passages like ravines and caves (for the wind, channeled through in this way, cools them, as it does in wells);983
7 · Moist rock
I.39.1.7 · Wachsmuth pp. 254-255
and ⟨those⟩ that flow through rock, moist rock at that (for stone is cold, and such stone especially so).984
8 · Water’s own nature
I.39.1.8 · Wachsmuth pp. 255
But if all water is cold just as it is fresh (for both belong to its nature), its heat, like the quality of its tastes, would arise from other things.985
9 · The source of the differences
I.39.1.9 · Wachsmuth pp. 255
Thus this argument too implies that water has no difference in itself, but differs through the powers of other things, if indeed some effects are produced by earth, others by fire, and others by air.986