Among the Natchez Indians of North America young braves who had taken their first scalps were obliged to observe certain rules of abstinence for six months. They might not sleep with their wives nor eat flesh; their only food was fish and hasty-pudding. If they broke these rules, they believed that the soul of the man they had killed would work their death by magic, that they would gain no more successes over the enemy, and that the least wound inflicted on them would prove mortal. When a Choctaw had killed an enemy and taken his scalp, he went into mourning for a month, during which he might not comb his hair, and if his head itched he might not scratch it except with a little stick which he wore fastened to his wrist for the purpose. This ceremonial mourning for the enemies they had slain was not uncommon among the North American Indians. Thus we see that warriors who have taken the life of a foe in battle are temporarily cut off from free intercourse with their fellows, and especially with their wives, and must undergo certain rites of purification before they are readmitted to society. Now if the purpose of their seclusion and of the expiatory rites which they have to perform is, as we have been led to believe, no other than to shake off, frighten, or appease the angry spirit of the slain man, we may safely conjecture that the similar purification of homicides and murderers, who have imbrued their hands in the blood of a fellow-tribesman, had at first the same significance, and that the idea of a moral or spiritual regeneration symbolised by the washing, the fasting, and so on, was merely a later interpretation put upon the old custom by men who had outgrown the primitive modes of thought in which the custom originated. The conjecture will be confirmed if we can show that savages have actually imposed certain restrictions on the murderer of a fellow-tribesman from a definite fear that he is haunted by the ghost of his victim. This we can do with regard to the Omahas of North America. Among these Indians the kinsmen of a murdered man had the right to put the murderer to death, but sometimes they waived their right in consideration of presents which they consented to accept. When the life of the murderer was spared, he had to observe certain stringent rules for a period which varied from two to four years. He must walk barefoot, and he might eat no warm food, nor raise his voice, nor look around. He was compelled to pull his robe about him and to have it tied at the neck even in hot weather; he might not let it hang loose or fly open. He might not move his hands about, but had to keep them close to his body. He might not comb his hair, and it might not be blown about by the wind. When the tribe went out hunting, he was obliged to pitch his tent about a quarter of mile from the rest of the people "lest the ghost of his victim should raise a high wind, which might cause damage." Only one of his kindred was allowed to remain