The modern practice of mesmerism contemplates two objects: one, the application of the Od force to produce local effects; the other, its employment to induce trance. In the present slight sketch I shall say nothing on the first subject; but let me describe how trance is induced. It is to be observed, that attention to certain conditions favours very much the success of the experiment. The room should not be too light; very few persons should be present; the patient and the operator should be quiet, tranquil, and composed; the patient should be fasting. The operator has then only to sit down before the patient, who is likewise sitting with his hands resting on his knees, and gently closed, with the thumbs upwards. The operator then lays his hands half-open upon the patient’s, pressing the thumbs against those of the patient, as it were taking thumbs: this is a more convenient attitude than taking hands in the ordinary way. The operator and patient have then only to sit still. An Od-current is established; and if the patient is susceptible, he will soon become drowsy, and perhaps be entranced at the first sitting. Instead of this, the two hands of the operator may be held horizontally with the fingers pointed to the patient’s forehead, and either maintained in this position, or brought downwards in frequent passes opposite to the patient’s face, shoulders, arms; the points of the fingers being held as near the patient as possible without touching. It is easy, theoretically, to explain the beneficial results which follow from the daily induction of trance for an hour or so, in various forms of disorder of the nervous system,—in epilepsy,—in tic-doloreux,—in nervous palsy, and the like. As long as the state of trance is maintained, so long is the nervous system in a state of repose. It is more or less completely put out of gear. It experiences the same relief which a sprained joint feels when you dispose it in a relaxed position on a pillow. A chance is thus given to the strained nerves of recovering their tone of health; and it is wonderful how many cases of nervous disorder get well at once through these simple means. As it is certain that there is no disease in which the nervous system is not primarily or secondarily implicated, it is impossible to foresee what will prove the limit to the beneficial application of mesmerism in medical practice.