Totem and Taboo collects four essays in which Freud carries psychoanalysis out of the consulting room and into anthropology. His governing assumption is stated at the start: the so-called savage races, especially the aboriginal peoples of Australia, show us a well-preserved early stage of the mental life we have all passed through, so their customs can be compared with the symptoms of neurotic patients. He is candid that this is a borrowing across fields that cannot do full justice to either, and offers it as a new factor added to the study of religion, morality, and society rather than a complete account.
The first essay takes up the dread of incest. Among totem tribes, Freud notes, the whole social organization seems built to prevent sexual relations within the clan, enforced through totemism and the rule of exogamy, and extended even to elaborate avoidance between a man and his mother-in-law. He reads this severe horror not as a sign that such races are free of the wish but as evidence of how strong the wish must be, since psychoanalysis finds the child's first desires turned toward the very relatives later forbidden.
The second essay turns to taboo, a word he traces to Polynesia and links to the sacred and the forbidden at once. Taboo prohibitions carry no justification and are simply taken for granted by those under them, which is what makes them resemble the senseless but binding prohibitions of compulsion neurosis. Freud's key term is ambivalence: behind every taboo lies an act that is both strongly desired and strongly feared, so that whoever breaks a taboo becomes dangerous because he tempts others to do the same. The basis of taboo, he concludes, is a forbidden action toward which there is a powerful unconscious pull.
The third essay examines animism, magic, and what Freud names the omnipotence of thought. Primitive peoples populate the world with spirits and souls and assume that the order of their ideas governs the order of things, so that to wish or to imitate is to cause. He maps three world-pictures onto stages of individual development: the animistic phase matches narcissism, the religious phase matches a child's dependence on parents, and the scientific phase matches maturity. The over-valuation of thought, he adds, survives in our own culture chiefly in art.
The fourth and longest essay reaches for the origin of it all. Combining the totem feast described by anthropologists with Darwin's hypothesis of a primal horde, Freud advances his boldest claim: long ago the brothers driven out by a violent, possessive father joined together, killed and devoured him, and afterward were overcome by remorse for the deed they had both hated and admired. From that guilt, he argues, came the two foundational taboos against killing the totem and against incest, and from the same source flowed the later forms of religion, which he reads as a long attempt to atone for the primal murder. The book ends by siding with action over thought, closing on the line that in the beginning was the deed.