Some of the gold mounted bezoars of Rudolph II are still to be seen in the Hofmuseum, at Vienna. One is surrounded by a gold band with a scroll pattern; another has a capping of gold and stands upon a golden base, and still another, capped and belted with gold, is attached by a chain to a golden bowl. This was probably to be used as a test of the freedom from poison of any beverage in the vessel. A bezoar of the eighteenth century is mounted upon a tree of gold, against the trunk of which a wild boar is leaning. This may be only a decorative adjunct, or it might be an indication of the particular animal source of this special bezoar.[436] The bezoars of Borneo are taken either from monkeys or porcupines. For medicinal use, the gratings are dissolved in water and the solution is administered as required. Skeats relates that he was once asked $200 by a native for a small stone, erroneously asserted to be a bezoar. This stone was carefully wrapped up in cotton and preserved in a tin box with some grains of rice, the owner firmly believing that the stone fed on the rice. A red monkey (semnopithecus) furnishes many of these bezoars, but those from the porcupine are supposed to be so much the more efficacious that the Sultan of Saik claims all bezoars of this kind found in his dominions as his personal property; nevertheless, many are said to be surreptitiously taken out of the country by Malayan or Chinese traders. A remarkably fine specimen in the possession of the Sultan is valued at $900; small ones may be worth no more than $40, but the value increases very rapidly with the size of the concretion. Though it is confidently believed that the bezoars work wonderful cures in diseases of the bowels and of the respiratory organs, the natives value them chiefly as aphrodisiacs, this action being secured either by wearing them or by taking them in solution.[437] [Illustration: BEZOARS OF EMPEROR RUDOLPH II, NOW IN THE HOFMUSEUM, VIENNA ] The Chinese work entitled P’ing-chou-k’o-t’an, by Chu Yü, written in the first quarter of the twelfth century, mentions the _mo-so_ stone (the bezoar) and states that it was worn in finger rings. Should anyone have reason to suppose that he had taken poison, all he had to do in order to escape any bad effects was to lick the bezoar stone set in his ring. The Chinese writer adds that it might thus be justly called “a life preserver.”[438] The Dayaks of Borneo have a method for producing bezoars which they call _guligas_. This is to shoot an animal with an unpoisoned arrow. When the wound heals, there is often a hardening of the skin, which finally results in the formation of a _guliga_. In some of these concretions the point of the arrow still remains. The _guligas_ of natural formation are frequently found between the flesh and the skin of apes and porcupines.[439]