Again, in the Pacific the people of one island always attribute hurricanes to the machinations of the people of the nearest island to windward. The wind comes from them; therefore (as their medicine-men can notoriously influence the weather), they must have sent the wind. This unneighbourly act is a casus belli, and through the whole of a group of islands the banner of war, like the flag of freedom in Byron, flies against the wind. The chief principle, then, of savage science is that antecedence and consequence in time are the same as effect and cause.(1) Again, savage science holds that LIKE AFFECTS LIKE, that you can injure a man, for example, by injuring his effigy. On these principles the savage explains the world to himself, and on these principles he tries to subdue to himself the world. Now the putting of these principles into practice is simply the exercise of art magic, an art to which nothing seems impossible. The belief that his Shamans or medicine-men practise this art is universal among savages. It seriously affects their conduct, and is reflected in their myths. (1) See account of Zuni metaphysics in chapter on American Divine Myths. The one general rule which governs all magical reasoning is, that casual connection in thought is equivalent to causative connection in fact. Like suggests like to human thought by association of ideas; wherefore like influences like, or produces analogous effects in practice. Any object once in a man's possession, especially his hair or his nails, is supposed to be capable of being used against him by a sorcerer. The part suggests the whole. A lock of a man's hair was part of the man; to destroy the hair is to destroy its former owner. Again, whatever event follows another in time suggests it, and may have been caused by it. Accompanying these ideas is the belief that nature is peopled by invisible spiritual powers, over which magicians and sorcerers possess influence. The magic of the lower races chiefly turns on these two beliefs. First, "man having come to associate in thought those things which he found by experience to be connected in fact, proceeded erroneously to invert their action, and to conclude that association in thought must involve similar connection in reality. He thus attempted to discover, to foretell, and to cause events, by means of processes which we now see to have only an ideal significance."(1) Secondly, man endeavoured to make disembodied spirits of the dead, or any other spirits, obedient to his will. Savage philosophy presumes that the beliefs are correct, and that their practical application is successful. Examples of the first of the two chief magical ideas are as common in unscientific modern times or among unscientific modern people as in the savage world. (1) Primitive Culture, i. 14.