Some waters are fatal, although they give no indication of this 1 either by smell or taste. In Arcadia, near Nonacris, the river called by the people there the Styx lures strangers to ruin, as its appearance and smell rouse no suspicion. This is like the drugs of accomplished poisoners, which cannot be detected save by their fatal effects. The water I mentioned a little above brings destruction with amazing swiftness, and allows no opportunity of applying a remedy. It hardens immediately it is drunk, and, much like chalk under the influence ofcccc 2 water, it sets and binds fast the bowels. There is a poisonous water in Thessaly, near Tempe, shunned by all cattle and wild beasts. It comes out through seams of iron and copper, and contains the power of softening the very hardest material. It does not nourish any trees either, and it kills grass. Certain rivers possess a peculiar and strange power. Some there are whose draught dyes whole flocks of sheep. Within a short time those that were black have white fleeces; in other cases those that came white go away black. This is what two rivers in Boeotia do, one of which from its effect is called Melas (Blackwater). Both the rivers issue from the same lake, to go on their opposite missions. So, too, in Macedonia, Theophrastus asserts there 3 is a river to which shepherds who desire to turn their sheep white bring them. If the sheep drink it for any length of time, their colour changes as if they had been dyed. But if those people want a dark wool, they have a dyer ready at hand who charges nothing; they have merely to drive the same flock to the river Peneus. I have recent authorities for the statement that there is a river in Galatia that has the same power of changing the colour in all animals, while in Cappadocia there is one which if drunk changes the colour of horses but not of any other animal; their skin is dappled with white spots.