Recherches, expériences et observations physiologiques sur l’homme dans l’état de somnambulisme naturel, et dans le somnambulisme provoqué par l’acte magnétique

Paris: J.G. Dentu, 1811. FIRST EDITION. Contemporary calf, spine label (a bit worn); interior fine. First edition of one of the first important studies on artificial and natural somnambulism. The author reaffirms that the major difference between artificial and natural somnambulism lies in the dependence of the magnetized (hypnotized) subject in relation to the magnetizer in the case of artificial somnambulism. He observes the changes in consciousness in a state of magnetic sleep, which will open the way to the notion of “unconscious”. He also provides an actual description of the magnetizing process. In detailing various cases he reveals manifestations of patients, abilities of practitioners, and discusses the dangers of the use of magnetic somnambulism.

Puységur (1751-1825) was a disciple of Mesmer and known as the discoverer of magnetic somnambulism. Despite no formal medical training, he taught himself and thereafter practiced magnetic therapy. “It was while working with mesmerism that he discovered what he called somnambulism which eventually evolved into today’s hypnotism ... [He] recognized that the trance provided an opportunity to muster the mind’s power to aid the patient.” Even after Mesmer decided that a trance was an unwanted phenomenon, Puysegur continued to collect data and developed a therapeutic regimen which involved what today we would call posthypnotic suggestion.

Caillet 2276; Crabtree 237; Heirs of Hippocrates, 1097.