Spirits of dead men, like other spirits, may assume fresh bodies, new forms, and forms not necessarily human. A favourite form is that of a snake: it was as a snake that the spirit of Anchises appeared and accepted the offerings made by his pious son. In their new forms the spirits of the dead are sometimes, as in this case, kindly, at other times malicious, but always to be treated with respect, always to be conciliated; for their power is great. They can in their turn cause disease, misfortune, death.
Another characteristic of the mental condition I am describing must not be omitted. Connection of thought, even though purely fortuitous, is taken to indicate actual connection of the things represented in thought. This connection is, of course, often founded on association of time or place, and once formed it is not easily broken. For example, any object once belonging to a man recalls the thought of him. The connection between him and that object is therefore looked upon as still existing, and he may be affected by the conduct shown towards it. This applies with special force to such objects as articles of clothing, and still more to footprints and to spittle, hair, nail-parings and excrement. Injury to these with malicious intent will hurt him from whom they are derived. In the same way a personal name is looked upon as inseparable from its owner; and savages are frequently careful to guard the knowledge of their true names from others, being content to be addressed and spoken of by a nickname, or a substituted epithet. The reason of this is that the knowledge of another's name confers power over that other: it is as though he, or at least an essential part of him, were in the possession of the person who had obtained the knowledge of his name. It is perhaps not an unfair deduction from the same premises that endows an image with the properties of its prototype—nay, identifies it with its prototype. This leads on the one hand to idol-worship, and on the other
