Mental Theraputics: How to Hypnotize. The first essential is the concentration of mind, a power natural to some, but which can be acquired by persistent practice by almost everyone. The hypnotizer must have a dominant thought of mastery over his subject and concentrate his whole mind on that thought. Then by holding some bright object, or even simply his fingers directly before and a little above the subject's eyes, repeatedly bidding him to gaze intently at the object presented, until he sees the pupil dilate and a glassy appearance come into the eye, he can then say, "now, sir, shut your eyes. You can't open them any more," and the subject is hypnotized and will act upon most suggestions made.