subjective, personality of man to assume, in obedience to the law of suggestion, any number of real or imaginary characters. The same power is exhibited by the subjective personality of a spirit medium when it assumes the names and characters of any number of spirits of the dead, whose names are suggested. The specific character of the mental operations of persons in whom the second personality is abnormally developed has not been recorded, so far as we are aware. It will be found, however, when observations are made in that direction, that they have practically no capacity for reasoning by the inductive process when under the control of the second personality. This will certainly be the case if the hypnosis is perfect. Otherwise it might be modified by the synchronous action of the objective mind. It is hoped that future observers will direct their attention to this question, to the end that a series of facts may be collated which shall assist in determining the direction and extent, as well as the exact limitations, of subjective mental power. When that is accomplished, the first great step will have been taken in bringing psychology within the domain of the exact sciences. [Illustration] CHAPTER XIX. THE PHYSICAL PHENOMENA OF SPIRITISM. The Intelligence manifested.--It is a Human Intelligence.--Inherent Probabilities.--Conditions requisite.--The Best Conditions.--A Living Organism necessary.--The Laws of Telepathy and Suggestion prevail.--Slate-Writing.--A Wonderful Slate-Writing Séance.--Telepathic and Psycho-Physical Power displayed in Perfection.--Demonstration of its Mundane Origin.--An Unexpected Phenomenon.--Summary of Results.--Syllogism.--General Conclusions.--Spiritistic Phenomena do not constitute Valid Evidence of a Life beyond the Grave.--An Argument for Immortality.