(M153) In a former part of this work we saw that homicides in general and victorious warriors in particular are often obliged to perform a variety of ceremonies for the purpose of ridding them of the dangerous ghosts of their victims.(537) If the ceremony of passing under the yoke was primarily designed, as I have suggested, to free the soldiers from the angry ghosts of the men whom they had slain, we should expect to find that the victorious Romans themselves observed a similar ceremony after a battle for a similar purpose. Was this the original meaning of passing under a triumphal arch? In other words, may not the triumphal arch have been for the victors what the yoke was for the vanquished, a barrier to protect them against the pursuit of the spirits of the slain? That the Romans felt the need of purification from the taint of bloodshed after a battle appears from the opinion of Masurius, mentioned by Pliny, that the laurel worn by soldiers in a triumphal procession was intended to purge them from the slaughter of the enemy.(538) A special gate, the _Porta Triumphalis_, was reserved for the entrance of a victorious army into Rome;(539) and it would be in accordance with ancient religious views if this distinction was originally not so much an honour conferred as a precaution enforced to prevent the ordinary gates from being polluted by the passage of thousands of blood-guilty men.(540) § 3. The External Soul in Animals. (M154) But in practice, as in folk-tales, it is not merely with inanimate objects and plants that a person is occasionally believed to be united by a bond of physical sympathy. The same bond, it is supposed, may exist between a man and an animal, so that the welfare of the one depends on the welfare of the other, and when the animal dies the man dies also. The analogy between the custom and the tales is all the closer because in both of them the power of thus removing the soul from the body and stowing it away in an animal is often a special privilege of wizards and witches. Thus the Yakuts of Siberia believe that every shaman or wizard keeps his soul, or one of his souls, incarnate in an animal which is carefully concealed from all the world. “Nobody can find my external soul,” said one famous wizard, “it lies hidden far away in the stony mountains of Edzhigansk.” Only once a year, when the last snows melt and the earth turns black, do these external souls of wizards appear in the shape of animals among the dwellings of men. They wander everywhere, yet none but wizards can see them. The strong ones sweep roaring and noisily along, the weak steal about quietly and furtively. Often they fight, and then the wizard whose external soul is beaten, falls ill or dies. The weakest and most cowardly wizards are they whose souls are incarnate in the shape of dogs, for the dog gives his human double no peace, but gnaws his heart and tears his body. The most powerful wizards are they whose external souls