Certain curious amulets called _magatama_ (crooked jewels) have been found in Japanese graves of the iron age;[398] they are formed of various materials, among others of steatite, jasper, carnelian, agate, rock crystal, chrysoprase and nephrite (jade). In the shell heaps of a period preceding the iron age, the magatama are frequently made of horn, or of boar’s or wolf’s teeth, and their peculiar form, which is variously explained as a symbol, may have been conditioned by the shape of the materials originally used. The _magatama_ were evidently regarded as amulets. “They are generally perforated at the thick end, and were worn on a string, together with beads and bugles of the same material.” These peculiar ornaments were used to adorn the statues of the gods and were also employed as imperial insignia and distinctive marks of high rank. At the present day they are numbered among the three emblems of sovereignty in Japan. A green and a red magatama are combined in the national emblem of Korea and a similar figure is used in China to symbolize the union of the masculine and feminine principles (Yang and Yin) in nature. Dr. Baelz believes that the swastika emblem, encountered in so many different parts of the world, belongs to the same order of ideas. The Bghai tribes of Burma have many superstitions in regard to stones, such as garnets, rock-crystal, chalcedony, carnelian, agate, onyx and others of less value, their repute not depending entirely or principally upon their quality as gem-stones. In almost every household is installed a stone fetish, and blood offerings are on occasion made to this. A question as to the reason for this offering elicited the following reply: “If we do not give it blood to eat it will eat us.” A common belief was that spirits good or bad dwelt in the stones, and in case a great misfortune befell a family, this was sometimes laid to the charge of such a spirit. The father of a family having died, his widow commanded her son to throw away their magic stone. This he did, but the spirit was not to be denied, for shortly afterward this very stone was found to have returned to its accustomed place, and had even brought two companion stones with it![399] Ruy Gonzalez de Clavijo, who travelled in the East during the years 1403-1406, gives a description of a slab of stone bearing the outlines of a “natural picture,” and placed in the church of St. Sophia, in Constantinople:[400]