Sensations.--Besides sight, sounds have sometimes been used for the purpose of inducing hypnotism. The ticks of a watch, for instance, placed at a little distance and listened to very intently, have been known to assist in securing the hypnotic state. Sometimes the sound of a gong, or an imitation of a cathedral chime, have been used in the same way. Soft music has also been used by operators with decided advantage. It is necessary that the sounds should be of a kind that do not disturb, but only attract attention to one sensation, and then, as concentration on this is secured, the hypnotic condition results. Practically any other sensation may be used in the same way. Touch is often employed. Mesmer stroked his patients gently, and others have used the same process with advantage. Some of the French workers in hypnotism have claimed that there were special portions of the body the stroking of which was likely to produce this favorable effect. They have called these regions zones hypnogenes--areas that give rise to hypnotic conditions. Strokings of the forehead, of the cheeks, of the hands, are favorite locations for these auxiliary touches. In this, as with regard to sound, the main thing is to concentrate attention on some one sensation without producing disturbing thoughts. Stroking.--Stroking seems to affect many people and to easily induce a sort of hypnoidal condition. It is done very naturally to a child when one wants to console or encourage or admonish slightly but kindly. In older people it is a familiar gesture among those who think much of one another, and represents a very natural tendency. Even in the midst of physical discomfort its effect is quite soothing, and it is evident that something resembling hypnotism is at work. Evidently, what really happens is a concentration of attention on the sensation thus produced, which concentration prevents distracting thoughts from making themselves felt and permits the words of the one who does the stroking to produce a deeper effect on the mind than would ordinarily be possible. This seems to be nature's method of making suggestion more effective. It has been adopted, quite spontaneously, by many of the pioneers in hypnotism as the result of their observations upon its efficacy. Lloyd Tuckey calls attention to an illustration of this practice, which makes clear its effectiveness and at the same time shows how naturally it suggests itself as a mode of using mental influence. He says: