The ancients set great store on the magical qualities of precious stones; indeed it has been maintained, with great show of reason, that such stones were used as amulets long before they were worn as mere ornaments. Thus the Greeks gave the name of tree-agate to a stone which exhibits tree-like markings, and they thought that if two of these gems were tied to the horns or necks of oxen at the plough, the crop would be sure to be plentiful. Again, they recognised a milkstone which produced an abundant supply of milk in women if only they drank it dissolved in honey-mead. Milk-stones are used for the same purpose by Greek women in Crete and Melos at the present day; in Albania nursing mothers wear the stones in order to ensure an abundant flow of milk. Again, the Greeks believed in a stone which cured snake-bites, and hence was named the snake-stone; to test its efficacy you had only to grind the stone to powder and sprinkle the powder on the wound. The wine-coloured amethyst received its name, which means "not drunken," because it was supposed to keep the wearer of it sober; and two brothers who desired to live at unity were advised to carry magnets about with them, which, by drawing the twain together, would clearly prevent them from falling out. The ancient books of the Hindoos lay down a rule that after sunset on his marriage night a man should sit silent with his wife till the stars begin to twinkle in the sky. When the pole-star appears, he should point it out to her, and, addressing the star, say, "Firm art thou; I see thee, the firm one. Firm be thou with me, O thriving one!" Then, turning to his wife, he should say, "To me Brihaspati has given thee; obtaining offspring through me, thy husband, live with me a hundred autumns." The intention of the ceremony is plainly to guard against the fickleness of fortune and the instability of earthly bliss by the steadfast influence of the constant star. It is the wish expressed in Keats's last sonnet: Bright star! would I were steadfast as thou art-- Not in lone splendour hung aloft the night.