recommended that when witches were led to the block or the stake, they should not be allowed to touch the bare earth, and a reason suggested for the rule was that if they touched the earth they might make themselves invisible and so escape. The sagacious author of _The Striped-petticoat Philosophy_ in the eighteenth century ridicules the idea as mere silly talk. He admits, indeed, that the women were conveyed to the place of execution in carts; but he denies that there is any deep significance in the cart, and he is prepared to maintain this view by a chemical analysis of the timber of which the cart was built. To clinch his argument he appeals to plain matter of fact and his own personal experience. Not a single instance, he assures us with apparent satisfaction, can be produced of a witch who escaped the axe or the fire in this fashion. “I have myself,” says he, “in my youth seen divers witches burned, some at Arnstadt, some at Ilmenau, some at Schwenda, a noble village between Arnstadt and Ilmenau, and some of them were pardoned and beheaded before being burned. They were laid on the earth in the place of execution and beheaded like any other poor sinner; whereas if they could have escaped by touching the earth, not one of them would have failed to do so.”(20) (M5) Apparently holiness, magical virtue, taboo, or whatever we may call that mysterious quality which is supposed to pervade sacred or tabooed persons, is conceived by the primitive philosopher as a physical substance or fluid, with which the sacred man is charged just as a Leyden jar is charged with electricity; and exactly as the electricity in the jar can be discharged by contact with a good conductor, so the holiness or magical virtue in the man can be discharged and drained away by contact with the earth, which on this theory serves as an excellent conductor for the magical fluid. Hence in order to preserve the charge from running to waste, the sacred or tabooed personage must be carefully prevented from touching the ground; in electrical language he must be insulated, if he is not to be emptied of the precious substance or fluid with which he, as a vial, is filled to the brim. And in many cases apparently the insulation of the tabooed person is recommended as a precaution not merely for his own sake but for the sake of others; for since the virtue of holiness or taboo is, so to say, a powerful explosive which the smallest touch may detonate, it is necessary in the interest of the general safety to keep it within narrow bounds, lest breaking out it should blast, blight, and destroy whatever it comes into contact with.