Full and precise directions are given by the old authorities as to the proper way to secure possession of the stone called _corvia_. On the Calends, or first day of April, eggs are to be taken out of a crow’s nest and boiled until they are quite hard; they are then to be allowed to cool off and are replaced in the nest. The female bird notes that the eggs have been tampered with and flies away in search of the corvia-stone. When she has found it, she bears it to the nest, and as soon as it touches the eggs they become fresh and fertile again. This is the auspicious moment for securing the stone, which must be quickly taken from the nest else it would lose its virtue.[17] The lucky owner of the stone is promised increase of wealth and honors, and the power to read the future. The fabled gem-bearing dragons of India were said to have sometimes fallen victims to the enchanter’s art. Certain mystic characters were woven in thread of gold upon a scarlet cloth, and this cloth was spread by the hunters before the dragon’s den. When the creature emerged, his eyes were fascinated by the strange letters in which the enchanter had infused a wonderful soporific power. Hypnotized by the sight, the dragon would fall into a deep slumber and the hunters would rush upon him and sever his head from his body. Within the head were found gems of brilliant hue, some of these possessing the power of rendering the wearer invisible.[18] The “Gem of Sovranty,” or the “Gem of the King of Kings,” may have been a purely poetic Hindu fancy, or possibly may have been the diamond. Its surpassing quality is emphasized by the declaration that though the earth produced the sapphire, the cat’s-eye, the topaz, the ruby, and the two mystic gems, the favorite of the sun, and the favorite of the moon, the Gem of the King of Kings was acknowledged to be the chief of all “for the sheen of that jewel spreads round about for a league on every side.” To King Milinda the following question was put: “Suppose that on the disappearance of a sovran overlord, the mystic Gem of Sovranty lay concealed in a cleft on the mountain peak, and that on another sovran overlord arriving at the supreme dignity it should appear to him, would you say, O King, that the gem was produced by him?” “Certainly not, sir,” replied the monarch, “the gem would be in its original condition. But it had received, as it were, a new birth through him.”[19]