Man Into Wolf; An Anthropological Interpretation of Sadism, Masochism and Lycanthropy is a book by Robert Eisler, published in 1948 . The text is based upon his readings in archeology and anthropology; anything not covered by these disciplines is then dealt with using Jungian methods of dream analysis and the theory of archetypes. For instance, his remarks concerning the nature of life in prehistory are largely derived from his interpretations of the dreams of psychotherapy patients.