No doubt the great majority of charms and amulets recorded by writers, have merely been selected by reason of casual connection. When any unusual event happened good or bad — the person looked for some cause in his own surroundings; and if he carried, or did, anything unusual, it was naturally connected with the event. Then, no doubt, there was much theorizing from very mixed assumptions, in order to construct a charm for a given purpose. How far human folly can go in such a way anyone may see in the tangible field of medicine by referring to ancient prescriptions.