But to return to other tales of Alexander in the _Lapidary_. Once he saw afar enchanters and enchantresses who slew and wounded the men of his army by their diabolical power until Alexander prayed to God, who revealed two stones which counteracted the sorcery. On another occasion when by Alexander’s order his barons had carried off certain gems, during the night following they suffered much insult from demons and were sore afraid, since sticks and stones were thrown about the camp by unseen hands and men were beaten without knowing whence the blows came. It thus became apparent that the demons cherished those gems as their especial property and were accustomed to perform occult operations with them of which they did not wish men to learn the secret. Alexander found that these gems would protect him from any beast, serpent, or demon, although the nocturnal experience of his barons would scarcely seem to support this last point. On a third occasion his troops were held motionless and gazed open-mouthed at certain stones, until a bird fluttered down and covered the gems with its outstretched wings. Then Alexander had his followers close their eyes and carry the stones away under cover and place them on top of the wall of one of his cities so that no one might scale the wall to spy upon the town. [Sidenote: Story of Alexander’s belt.] Yet another curious story of Alexander and a stone is repeated by Peter of Abano in his work on poisons[833] from a treatise “On the Nature of Serpents” which he ascribes to Aristotle. Alexander always wore a certain stone in his belt to give him good luck in his battles, but on his return from India, while bathing in the Euphrates, he removed the belt, whereupon a serpent suddenly appeared, bit the stone out of the belt, and vomited it into the river. Deprived of his talisman, Alexander presently met his death.[834] [Sidenote: The royal _Lapidary_ of Wenzel II of Bohemia.] Another _Lapidary_, printed as Aristotle’s at Merseburg in 1473, is really a compilation of previous medieval works on the subject with the addition of some items derived from the personal knowledge or experience of the author. It was composed “to the honor of almighty God and the glory and perpetual memory of that virtuous and most glorious prince, Wenzel II, King of Bohemia” (1278-1305). As the treatise itself states, “the Lapidary of Aristotle in the recent translation from the Greek” is only one of its sources along with Avicenna, Constantinus Africanus, Albertus Magnus, and others. [Sidenote: _Chiromancy_ and _Physiognomy of Aristotle_.]