We do not know almost anything about the life of Léon Petitjean, with the exception of an article that he wrote in 1911 for the Annales des Sciences psychiques, in which he narrated his spiritualistic experience. In the beginning of the 20th century Petitjean discovered his mediumistic abilities and began writing messages dictated by the spirits, among others those from the spirit of his deceased mother. All his works, except that of the abcd collection, seem to have disappeared. Another was reproduced in the Minotaure (André Breton, “Le message automatique,” in Minotaure, no. 3-4, 1933, 2nd print Geneva, Skira, 1981, p. 58).