Crates of Pergamus relates, that there formerly existed in the vicinity of Parium, in the Hellespont, a race of men whom he calls Ophiogenes, and that by their touch they were able to cure those who had been stung by serpents, extracting the poison by the mere imposition of the hand.[877] Varro tells us, that there are still a few individuals in that district, whose saliva effectually cures the stings of serpents. The same, too, was the case with the tribe of the Psylli,[878] in Africa, according to the account of Agatharchides; these people received their name from Psyllus, one of their kings, whose tomb is in existence, in the district of the Greater Syrtes. In the bodies of these people there was by nature a certain kind of poison, which was fatal to serpents, and the odour of which overpowered them with torpor: with them it was a custom to expose children immediately after their birth to the fiercest serpents, and in this manner to make proof of the fidelity of their wives, the serpents not being repelled by such children as were the offspring of adultery.[879] This nation, however, was almost entirely extirpated by the slaughter made of them by the Nasamones, who now occupy their territory.[880] This race, however, still survives in a few persons who are descendants of those who either took to flight or else were absent on the occasion of the battle. The Marsi, in Italy, are still in possession of the same power, for which, it is said, they are indebted to their origin from the son of Circe, from whom they acquired it as a natural quality. But the fact is, that all men possess in their bodies a poison which acts upon serpents, and the human saliva, it is said, makes them take to flight, as though they had been touched with boiling water. The same substance, it is said, destroys them the moment it enters their throat, and more particularly so, if it should happen to be the saliva of a man who is fasting.[881] Above the Nasamones,[882] and the Machlyæ, who border upon them, are found, as we learn from Calliphanes, the nation of the Androgyni, a people who unite the two sexes in the same individual, and alternately perform the functions of each. Aristotle also states, that their right breast is that of a male, the left that of a female.[883] Isigonus and Nymphodorus inform us that there are in Africa certain families of enchanters,[884] who, by means of their charms, in the form, of commendations, can cause cattle to perish, trees to wither, and infants to die. Isigonus adds, that there are among the Triballi and the Illyrii, some persons of this description, who also have the power of fascination with the eyes, and can even kill those on whom they fix their gaze for any length of time, more especially if their look denotes anger; the age of puberty is said to be particularly obnoxious to the malign influence of such persons.[885]