Precious metals as well as precious stones were used in the manufacture of amulets. The Scandinavians carried metal effigies carved out of gold or silver, or incised upon tiles, perpetually as amulets. They were safeguards against diseases and physical infirmities. They were also administered internally in cases where powerful cures were needed. Chaucer says: "For gold in physic is a cordial, Therefore he loved gold in special." The Basilideans, and other sects developed from the Gnostic systems, assigned great power to stone amulets, and prepared them for their initiates, who used them for identification and for curative purposes. They quickly acquired a celebrity undiminished for ages, and were known under the general name of Abraxas. They were composed of various materials, glass, paste, sometimes metals, but principally of various kinds of stones. Through the irresistible might of Abrax, their supreme divinity, the Basilideans were protected and cured. Clement of Alexandria strictly interdicted the use of gems for personal ornamentation, with evident allusion to the Abraxas stones. These stones had various inscriptions carved upon them, most of which had some hidden meaning of great puissance. One of them, for example, is engraven with Armenian letters, and contains a standing invocation for fruitful delivery; in its medicinal property it was evidently a cure for sterility.[93] From the stone itself the word "Abraxas" came to be used as an amulet when written on paper. The numerical equivalent of the Greek letters when added together thus, A = 1, B = 2, R = 100, A = 1, X = 60, A = 1, S = 200, is 365. The significance of this was that the deity was the ruler of 365 heavens, or of the angels inhabiting these heavens; he was also ruler over the 365 days of the year. Notwithstanding the fact that it was referred to by the Greek fathers, the name was evidently Egyptian in origin, some of the figures on the stones being strictly Egyptian. Amulets in the form of inscriptions were called "Characts," the word Abraxas being an example. The very powerful word "Abracadabra" was derived from Abraxas, and when written in the proper way and worn about the person was supposed to have a magical efficacy as an antidote against ague, fever, flux, and toothache. Serenus Samonicus, a physician in the reign of Caracalla, recommends it very highly for ague, instructing how it should be written, and commanding it to be worn around the neck. It might be written in either of two ways: reading down the left side and up the right must spell the same word as at the top; or, having the left side always start the same, reading up the right side should be the same as the top line. Below are the two forms: