One of the most interesting phases of hypnotism is that of post-hypnotic suggestion, to which reference has already been made. It is true that a suggestion made during the hypnotic condition as to what a person will do after coming out of the hypnotic sleep may be carried out.
A certain professional hypnotizer claims that once he has hypnotized a person he can keep that person forever after under his influence by means of post-hypnotic suggestion. He says to him while in the hypnotic sleep: "Whenever I look at you, or point at you, you will fall asleep. No one can hypnotize you but me. Whenever I try to hypnotize you, you will fall asleep."
