Dr. Levy-Bruhl presents a dramatic picture of the primitives who live in a world that is capricious, unpredictable, and unstable; under the power of spirits both good and evil, to be worshipped or propitiated by ceremonies, dances, and religious rites. Dr. Levy-Bruhl shows how the mind of the primitive has no conception of the world of abstract though, natural law, causation, and categories, which has been opened up to the mind by science and philosophy. In addition, the author explains omens, talismans, amulets, ancestor worship, witchcraft, insect, defilement, and purification as fundamental parts of the primitive existence.