Geratite is black. It is of such a nature that if a man opens his mouth and puts the stone under his tongue he will divine what another person thinks of him, and can win any woman's devotion. This stone can be tried as follows: let a man anoint himself with milk and honey, go out into the sunshine where insects swarm, and if he has the stone in his mouth the insects will not attack him; if he removes the stone they will at once sting him. Chelidonius Chelidonius is a stone which one finds in the stomach of a swallow. It is not very beautiful, but it surpasses all the beautiful stones in usefulness. It is of ten sorts and of two colors—black and red. The red is good for the frenzy which seizes people who are moon-struck; it restores their sanity to madmen and cures those who are pining away. He who carries this stone will be a good orator and will be much beloved. One must carry it wrapped in linen cloth and suspended under the left arm. The black, if worn in the same way, aids a man to accomplish important things he has undertaken; it is also a help against the threats and rages of kings and princes. The water in which it is washed is helpful to diseased eyes. If wrapped in linen cloth of saffron tint, it drives away fever and restrains the humors which injure the body. Coral Coral is a stone which grows in the sea like a tree. It is green there where it grows, but when it is exposed to the air it hardens and becomes red. It is like a bush hardly half a foot high. It is very good to carry about, as say the authors Zoroaster and Metrodorus, for it protects one from lightning and tempest, and if one scatters it on vines or among olive trees, or upon a seeded field, it will be a protection from hail and other storms. It makes fruits multiply, it drives away phantoms, it gives a good beginning and a prosperous conclusion. Heliotrope Heliotrope is of such a nature that if one puts it in a basin of water opposite the sun, it makes the sun become red and creates an eclipse. In a little while it makes the water boil up over the basin's edge, and fall like a shower of rain. He who wears this can prophesy many things. It gives a man praise and good health, it stanches the flow of blood, it overcomes poison and treachery. Any one who takes the herb called heliotrope and binds the two together with the proper incantation can walk where he pleases and no one will see him. This stone comes from Ethiopia, from Cypress, and from Africa. It is very much like the emerald, but has red spots. Pearl