_First experiment_.[*] _Preparatory_.--Ask the subject to stand upright, with the body as stiff as an iron bar, the feet close together from toe to heel, while keeping the ankles flexible as if they were hinges. Tell him to make himself like a plank with hinges at its base, which is balanced on the ground. Make him notice that if one pushes the plank slightly either way it falls as a mass without any resistance, in the direction in which it is pushed. Tell him that you are going to pull him back by the shoulders and that he must let himself fall in your arms without the slightest resistance, turning on his ankles as on hinges, that is to say keeping the feet fixed to the ground. Then pull him back by the shoulders and if the experiment does not succeed, repeat it until it does, or nearly so. [*] These experiments are those of Sage of Rochester. _Second experiment_.--Begin by explaining to the subject that in order to demonstrate the action of the imagination upon us, you are going to ask him in a moment to think: "I am falling backwards, I am falling backwards. . . ." Tell him that he must have no thought but this in his mind, that he must not reflect or wonder if he is going to fall or not, or think that if he falls he may hurt himself, etc., or fall back purposely to please you, but that if he really feels something impelling him to fall backwards, he must not resist but obey the impulse. Then ask your subject to raise the head high and to shut his eyes, and place your right fist on the back of his neck, and your left hand on his forehead, and say to him: "Now think: I am falling backwards, I am falling backwards, etc., etc. . ." and, indeed, "You are falling backwards, You . . . are . . . fall . . . ing . . . back . . . wards, etc." At the same time slide the left hand lightly backwards to the left temple, above the ear, and remove very slowly but with a continuous movement the right fist. The subject is immediately felt to make a slight movement backwards, and either to stop himself from falling or else to fall completely. In the first case, tell him that he has resisted, and that he did not think just that he was falling, but that he might hurt himself if he did fall. That is true, for if he had not thought the latter, he would have fallen like a block. Repeat the experiment using a tone of command as if you would force the subject to obey you. Go on with it until it is completely successful or very nearly so. The operator should stand a little behind the subject, the left leg forward and the right leg well behind him, so as not to be knocked over by the subject when he falls. Neglect of this precaution might result in a double fall if the person is heavy.