And not only this, but human beings even, Theophrastus tells us, are sensible of this difference: for persons who drink the water of the Sybaris, he says, become more swarthy and more hardy, the hair inclining to curl: while those, again, who drink of the Crathis become fair and more soft-skinned, with the hair growing straight and long. So, too, in Macedonia, persons who wish the produce to be white, drive their cattle to the river Haliacmon, while those who desire a black or tawny colour, take them to water at the Axius. Upon the same authority, too, we learn that in certain localities, as in the country of the Messapii, for instance, all the productions, the cereals even, grow of a tawny colour; and that at Lusi,[1] in Arcadia, there is a certain fountain in which land-mice live and dwell. The river Aleos, which passes through Erythræ, promotes the growth of hair upon the body.