The stone that attracted hair was the lightest of all stones and very fragile; a piece as large as a man’s fist weighed but a drachm. It looked like a piece of fur, but when touched was found to be a stone. The strange powers of this extraordinary substance could easily be demonstrated, for if placed on a hairy spot of man or beast the hair was extracted, while if it were rubbed over a bald spot the hair was made to grow.[129] Probably the appearance of certain minerals covered with fine, hair-like spines, suggested the idea that the body of the stone had attracted hair to itself, and thus gave rise to this strange belief in the depilatory power of the stone, or it may have been a form of amber that, owing to its opacity, was not recognized as being the same as the transparent variety. The Arabic Aristotle relates many wonderful tales of stones found by Alexander the Great during his Asiatic campaigns (327–323 B.C.). While these are all apocryphal, there can be no doubt that it was subsequent to these campaigns that western Europe was first made familiar with many of the precious stones of Persia and India. One of the stones reported by “Aristotle” bore the name _el behacte_ or _baddare_, rendered in a Hebrew version _dar_ (pearl?). This was the stone that attracted men, as the loadstone attracted iron. A quantity of these stones were found on the seashore by the soldiers of Alexander’s army, but the men were so fascinated by their aspect as to be unable to gather them up. Therefore Alexander ordered that the soldiers should veil their faces, or close their eyes, and, after covering the marvellous stones with a cloth, should take them away without once looking at them. Hereupon Alexander gave commands that a wall should be built around “a certain city.”[130] Possibly we have here a distant echo of the pearl gates of the New Jerusalem. Two other strange stones are described, one of these appearing on the surface of the water only during the night, while the other shows itself during the daytime and sinks beneath the surface as soon as the sun sets. The “daystones,” according to the legend, were quite useful to Alexander in his campaigns, for if they were attached to the necks of horses or beasts of burden, the horses would not neigh, and the other animals would be equally mute as long as they bore the stones, so that the passage of the army would not be revealed to the enemy. The “night-stones,” on the other hand, produced an entirely opposite effect, for when wearing them the animals uttered their respective cries unceasingly. We are not told that Alexander ever used them to provide an animal symphony as martial music for his soldiers.