The dragons, however, are prized more for the precious stones in their heads, which the Indians quickly cut off as soon as they have bewitched them. The pupils of the eyes of the hill dragons are a fiery stone possessing irresistible virtue for many occult purposes,[1192] while in the heads of the mountain dragons are many brilliant stones of flashing colors which exert occult virtue if set in a ring, “and they say that Gyges had such a ring.”[1193] But there are many marvelous stones outside the heads of dragons. “Who does not know the habits of birds,” says Apollonius to Damis in one of his disquisitions upon natural phenomena,[1194] “and that eagles and storks will not build their nests without placing in them, the one the stone _aetites_, and the other the _lychnites_, as aids in hatching and to drive snakes away?” On parting from the Indian king Phraotes, Apollonius as usual refused to accept money presents but picked up one of the gems that were offered him with the exclamation, “O rare stone, how opportunely and providentially have I found you!”[1195] Philostratus supposes that he detected some occult and divine power in this particular stone. The Brahmans had gems so huge that from one of them a goblet could be carved large enough to slake the thirst of four men in midsummer, but in this case nothing is said of occult virtue.[1196] The Brahman Iarchas felt sure that he was the reincarnation of the hero Ganges, son of the river Ganges, because as a mere child he knew where to dig for the seven swords of adamant which Ganges had fixed in the earth.[1197] Presumably these were magic swords and their virtue in part due to the stone adamant of which they were made. Less is said in the _Life_ of the virtues of herbs than of gems, but the Indians made a nuptial ointment or love-charm from balm distilled from trees,[1198] and drugs and poisons are mentioned more than once, mandragora being described as a soporific drug rather than a deadly poison.[1199] [Sidenote: Absence of number mysticism.] Considering that Apollonius was a Pythagorean, there is surprisingly little said concerning perfect numbers and their mystic significance. Aside from the seven rings and seven swords already mentioned, about the only instance is the question asked by Apollonius whether eighteen, the number of the Brahman sages at the time of his visit, had any especial importance.[1200] He remarked that eighteen was not a square, nor a number usually held in esteem and honor like ten, twelve, and sixteen. The Brahmans agreed that there was no particular significance in eighteen, and further informed him that they maintained no fixed number of members but had varied from only one to as many as seventy according to the available supply of worthy men. [Sidenote: _Mantike_ or the art of divination.]