Primitive man regarded himself as being in debt to the spirits, as standing in need of redemption. As the savages looked at it, in justice the spirits might have visited much more bad luck upon them. As time passed, this concept developed into the doctrine of sin and salvation. The soul was looked upon as coming into the world under forfeit—original sin. The soul must be ransomed; a scapegoat must be provided. The head-hunter, in addition to practicing the cult of skull worship, was able to provide a substitute for his own life, a scapeman.

The savage was early possessed with the notion that spirits derive supreme satisfaction from the sight of human misery, suffering, and humiliation. At first, man was only concerned with sins of commission, but later he became exercised over sins of omission. And the whole subsequent sacrificial system grew up around these two ideas. This new ritual had to do with the observance of the propitiation ceremonies of sacrifice. Primitive man believed that something special must be done to win the favor of the gods; only advanced civilization recognizes a consistently even-tempered and benevolent God. Propitiation was insurance against immediate ill luck rather than investment in future bliss. And the rituals of avoidance, exorcism, coercion, and propitiation all merge into one another.

Observance of a taboo was man's effort to dodge ill luck, to keep from offending the spirit ghosts by the avoidance of something. The taboos were at first nonreligious, but they early acquired ghost or spirit sanction, and when thus reinforced, they became lawmakers and institution builders. The taboo is the source of ceremonial standards and the ancestor of primitive self-control. It was the earliest form of societal regulation and for a long time the only one; it is still a basic unit of the social regulative structure.

The respect which these prohibitions commanded in the mind of the savage exactly equaled his fear of the powers who were supposed to enforce them. Taboos first arose because of chance experience with ill luck; later they were proposed by chiefs and shamans—fetish men who were thought to be directed by a spirit ghost, even by a god. The fear of spirit retribution is so great in the mind of a primitive that he sometimes dies of fright when he has violated a taboo, and this dramatic episode enormously strengthens the hold of the taboo on the minds of the survivors.

Among the earliest prohibitions were restrictions on the appropriation of women and other property. As religion began to play a larger part in the evolution