Susceptibility.--As to the number of people who are susceptible to hypnotism, there are great differences of opinion. Liebault declared that practically every one is susceptible in the hands of a patient operator. In a carefully made series of cases his failures were less than three per cent. Van Rentergehem and Van Eeden, in a series of over 1,000 persons, failed only with fifty-eight, or little more than five per cent. Schrenk-Notzing's statistics, collected from many countries, seem to show that only about six per cent. were uninfluenced. Bernheim, at Nancy, was not nearly so successful as Liebault, his master, and his failures amounted to twenty-five per cent. at the beginning and at least twenty per cent. later. I remember that when I was at the Saltpetriere fifteen years ago, they were inclined to discount the enthusiasm of the Nancy school with regard to the value and significance of hypnotism. They insisted that probably not more than one out of two of the persons presenting themselves at a nervous clinic could be hypnotized to the extent that is ordinarily associated with the word--could be brought beyond the drowsy stage. There are other workers in the subject who have insisted that not more than one out of three ordinary individuals can be so {160} deeply hypnotized as to exhibit the ordinary symptoms. These symptoms consist of complete neglect of surroundings and absolute absorption in the suggestions of the operator. Some people can be hypnotized to the extent of being thrown into sleep and yet walk and talk under the absolute control of the operator. These are so-called somnambules, the class of persons who are exhibited by professional hypnotizers who want to attract popular attention, and, indeed, the class usually exhibited by physicians before medical societies, and even by professors before their classes. This extreme susceptibility is, however, quite rare. Even the most ardent advocates of hypnotism and of the susceptibility of humanity to it do not claim that more than one in ten of average individuals can be influenced to this degree. There are milder degrees of hypnotism than this, until we reach a state in which all the patients feel is a certain dreamy sense of well-being and a heaviness of the eyes, with a readiness to respond to suggestions. Most people who think of the somnambulistic stage as representing hypnotism would not consider these latter to have been at all subjected to the hypnotic state.