Animal Magnetism. This is the theory offered by Mesmer, and those who hold it assume that “the hypnotizer exercises a force, independently of suggestion, over the subject. They believe one part of the body to be charged separately, or that the whole body may be filled with magnetism. They recognize the power, of suggestion, but they do not believe it to be the principal factor in the production of the hypnotic state.” Those who hold this theory today distinguish between the phenomena produced by magnetism and those produced by physical means or simple suggestion. The Neurosis Theory. We have already explained the word neurosis, but we repeat here the definition given by Dr. J. R. Cocke. “A neurosis is any affection of the nervous centers occurring without any material agent producing it, without inflammation or any other constant structural change which can be detected in the nervous centers. As will be seen from the definition, any abnormal manifestation of the nervous system of whose cause we know practically nothing, is, for convenience, termed a neurosis. If a man has a certain habit or trick, it is termed a neurosis or neuropathic habit. One man of my acquaintance, who is a professor in a college, always begins his lecture by first sneezing and then pulling at his nose. Many forms of tremor are called neurosis. Now to say that hypnotism is the result of a neurosis, simply means that a person’s nervous system is susceptible to this condition, which, by M. Charcot and his followers, is regarded as abnormal.” In short, M. Charcot places hypnotism in the same category of nervous affections in which hysteria and finally hallucination (medically considered) are to be classed, that is to say, as a nervous weakness, not to say a disease. According to this theory, a person whose nervous system is perfectly healthy could not be hypnotized. So many people can be hypnotized because nearly all the world is more or less insane, as a certain great writer has observed.