Christian Scientists and Mental Healers are often afraid of themselves acquiring the disease which they drive out of their patient; they sometimes speak of the effort that it costs them to shake it off. I was told a story the other day, which I have proved not to be true, but which is evidence of the belief. A woman said to me some such words as these: "My friend so-and-so, who is a Mental Healer, was staying in the country. She saw a woman there with a strange look. She asked what was wrong, and found that this woman was expecting a periodical fit of madness. She offered to undertake her cure, and brought her to her own house. The patient became violent, but my friend was able by faith and prayer to soothe her till she fell asleep. My friend went downstairs exhausted, and lay upon the sofa. Presently she saw strange shadows coming into the room and knew they had come from the patient upstairs, and these shadows, taking the form of swine, threw themselves upon her and only after a long struggle could she throw them off." The swine and their attack were all moonshine, but the healer, whom I found and questioned, did believe that she saw shadows leaving the patient. The transference of disease was a generally recognized part of medieval and ancient medicine; and Albert de Rochas gives considerable space to it in his _L'Extériorisation de la Sensibilité_, Paris, 1909. He quotes from a seventeenth-century writer, Abbé de Vellemort, many examples from medical and scientific writers of that time who believed themselves to have transferred diseases from their patients to animals and to trees and to various substances, "Mumia" as they called them, which absorb _des esprits qui résident dans le sang_ and then describes various experiments made in 1885 by Dr. Babinski "Chef de Clinique de M. Charcot" in transferring now by magnets, now by suggestion various forms of nervous disease from one patient to another. Where these diseases were produced in the first instance by suggestion, the patient from whom the disease was transferred, was freed from it, but where the disease was natural and the cause of the patient being at the hospital, there was no cure although in one case there was improvement. Albert de Rochas then quotes as follows from a lecture given by Dr. Luys to La Société de Biologie in 1894. "M. D'Arsonval has, according to a communication from an English physician, given an account at the last meeting of the Société de Biologie, of the persistent action in a magnetized iron bar of the magnetic fluid, which to a certain extent, kept a memory of its former state. "My researches of the same kind have given me proofs some time since of analogous phenomena with the help of magnetized crowns placed on the head of a subject in an hypnotic state.