When it is possible to perform initial hypnotic experiments in a room especially prepared and best adapted to the purpose, it will be found most advantageous to have the room pervaded by some agreeable and indistinct odor. A mixture of faint odors is preferable. Probably the best single odor is that of sandal wood. It produces a drowsy feeling even to those who are not being hypnotized. As it is an odor not familiar to everyone, it is especially useful, for pronounced odors are unfavorable, influences.

Never try to hypnotize a person in a room where there is tobacco smoke, and do not allow your breath to be tainted with onions, garlic and similar articles, as disagreeable odors detract the mind and hinder hypnosis.