"They have the ability," writes Dr. COCKE, "to resist this state or bring it on at will. Many of them describe beautiful scenes from Nature, or some mighty cathedral with its lofty dome, or the faces of imaginary beings." This writer's own first experience of self-hypnotism was very remarkable. He had been told by a hypnotizer to keep the number twenty-six in his mind. He did so, and after hearing a ringing in his ears and then a strange roaring he felt that spirits were all round him--music sounding and a sensation as of expanding. But self-hypnotizing, by the simple easy process of trusting to ordinary sleep, is better adapted to action delayed, or states of mind. These may be: _A desire to be at peace or perfectly calm_. After a few repetitions it will be found that, though irritating accidents may countervene, the mind will recur more and more to calm. _To feel cheerful or merry_. _To be in a brave, courageous, hearty or vigorous mood_. _To work hard without feeling weary_. This I have fully tested with success, and especially mention it for the benefit of students. All of my intimate friends can certify what I here assert. _To keep the faculty of quickness of perception alert_, as, for instance, when going out to perceive more than usual in a crowd. A botanist or mineralogist may awaken the faculty with the hope of observing or finding with success. _To be susceptible to beauty_, as, for instance, when visiting a scene or gallery. In such cases it means to derive Attention from Will. The habitually trained Forethought or Attention is here a _great_ aid to perception. _To read or study keenly and observantly_. This is a faculty which can be very much aided by forethought and self-suggestion.