active service, the owner kept it in an iron box to guard it against fairies, who, as is well known, cannot abide iron.[40] [Medicinal plants, water, are not allowed to touch the earth.] Pliny mentions several medicinal plants, which, if they were to retain their healing virtue, ought not to be allowed to touch the earth.[41] The curious medical treatise of Marcellus, a native of Bordeaux in the fourth century of our era, abounds with prescriptions of this sort; and we can well believe the writer when he assures us that he borrowed many of his quaint remedies from the lips of common folk and peasants rather than from the books of the learned.[42] Thus he tells us that certain white stones found in the stomachs of young swallows assuage the most persistent headache, always provided that their virtue be not impaired by contact with the ground.[43] Another of his cures for the same malady is a wreath of fleabane placed on the head, but it must not touch the earth.[44] On the same condition a decoction of the root of elecampane in wine kills worms; a fern, found growing on a tree, relieves the stomach-ache; and the pastern-bone of a hare is an infallible remedy for colic, provided, first, it be found in the dung of a wolf, second, that it docs not touch the ground, and, third, that it is not touched by a woman.[45] Another cure for colic is effected by certain hocus-pocus with a scrap of wool from the forehead of a first-born lamb, if only the lamb, instead of being allowed to fall to the ground, has been caught by hand as it dropped from its dam.[46] In Andjra, a district of Morocco, the people attribute many magical virtues to rain-water which has fallen on the twenty-seventh day of April, Old Style; accordingly they collect it and use it for a variety of purposes. Mixed with tar and sprinkled on the door-posts it prevents snakes and scorpions from entering the house: sprinkled on heaps of threshed corn it protects them from the evil eye: mixed with an egg, henna, and seeds of cress it is an invaluable medicine for sick cows: poured over a plate, on which a passage of the Koran has been written, it strengthens the memory of schoolboys who drink it; and if you mix it with cowdung and red earth and paint rings with the mixture round the trunks of your fig-trees at sunset on Midsummer Day, you may depend on it that the trees will bear an excellent crop and will not shed their fruit untimely on the ground. But in order to preserve these remarkable properties it is absolutely essential that the water should on no account be allowed to touch the ground; some say too that it should not be exposed to the sun nor breathed upon by anybody.[47] Again, the Moors ascribe great magical efficacy to what they call "the sultan of the oleander," which is a stalk of oleander with a cluster of four pairs of leaves springing from it. They think that the magical virtue is greatest if the stalk has been cut immediately before midsummer.