Anselmus de Boot, court physician of Emperor Rudolph II, tells a story of a turquoise that, after being thirty years in the possession of a Spaniard, was offered for sale with the rest of the owner’s property. Every one was amazed to find it had entirely lost its color; nevertheless De Boot’s father bought it for a trifling sum. On his return home, however, ashamed to wear so mean-looking a gem, he gave it to his son, saying, “Son, as the virtues of the turquoise are said to exist only when the stone has been given, I will try its efficacy by bestowing it upon thee.” Little appreciating the gift, the recipient had his arms engraved on it as though it had been only a common agate and wore it as a signet. He had scarcely worn it a month, however, before it resumed its pristine beauty and daily seemed to increase in splendor. Could we accept this statement as true we would have here an altogether unique instance of the recovery by a turquoise of the blue color it had lost. Not long after, the powers of De Boot’s turquoise were put to the test. As he was returning to Bohemia from Padua, where he had just taken his degree, he was forced to traverse a narrow and dangerous road at night. Suddenly his horse stumbled and threw him heavily to the ground, but, strange to say, neither horse nor rider was injured by the fall. Next morning, while washing his hands, De Boot remarked that about a quarter of his turquoise had broken away. Nevertheless the stone did not lose its virtue. Some time afterward, when the wearer was lifting a very heavy pole, he felt all at once a sharp pain in his side and heard his ribs crack, so that he feared he had injured himself seriously. However, it turned out that he had not broken any bones but had simply strained himself; but, on looking at his turquoise, he saw that it had again broken into two pieces.[158] [Illustration: TURQUOISE NECKLACE, THIBET. Field Museum, Chicago.] A singular virtue ascribed to the turquoise was that of striking the hour correctly, if the stone were suspended from a thread held between the thumb and index-finger in such a way that a slight vibration would make the stone strike against the side of a glass. De Boot states that he made the experiment successfully, but he very sensibly explains the apparent wonder by the unconscious effect of the mind on the body. The expectation that the stone was going to strike a certain number of times induced an involuntary movement of the hand.[159] The turquoise seems to have been worn almost exclusively by men at the beginning of the seventeenth century, for De Boot, writing in 1609, said that it was so highly regarded by men that no man considered his hand to be well adorned unless he wore a fine turquoise. Women, however, rarely wore this gem.[160] This custom was much in vogue among the Englishmen who travelled in the Orient, until a score of years ago.