I. _Hypothesis of an Abnormal Psychico-neural Relation as the essence of trance._—I admit that it is a very clumsy expedient to assume that the mind can, as it were, get loose in the living body, and, while remaining there in a partially new alliance, exercise some of its faculties in unaccustomed organs—which organs lose, for the same time, their normal participation in consciousness; and farther, that the mind can, partially indeed, but so completely disengage itself from the living body, that its powers of apprehension may range with what we are accustomed to consider the properties of free spirit, unlimitedly as to space and time. I adopt the hypothesis upon compulsion—that is to say, because I see no other way of accounting for the most remarkable trance-phenomena. In due time, it is to be expected that a simple inductive expression of the facts will take the place of my hypothetical explanation. But not the less may the latter, crude as it is, prove of temporary use, by bringing together in a connected view many new and diversified phenomena, and planting the subject in a position favourable for scientific scrutiny. Let me arrange, in their most persuasive order, the facts which seem to justify the hypothesis above enunciated. 1. In many cases of waking-trance, the patient does not see with his eyes, hear with his ears, nor taste with his tongue, and the sense of touch appears to have deserted the skin. At the same time, the patient sees, hears, and tastes things applied to the pit of the stomach, or sees and hears with the back of the head, or tips of the fingers. 2. In the first imperfect trance-waking from initiatory trance, the patient’s apprehension of sensuous impressions often appears to have entirely deserted his own body, and to be in relation with the sentient apparatus in his mesmeriser’s frame—for, if you pull his hair, or put mustard in his mouth, he does not feel either; but he is actually alive to the sensations which these impressions excite, if the hair of the mesmeriser is pulled, or mustard placed on the mesmeriser’s tongue. The sensations excited thus in the mesmeriser, and these alone, the entranced person realizes as his own sensations. 3. About the same time, the entranced person displays no will of his own, but his voluntary muscles execute the gestures which his mesmeriser is making, even when standing behind his back. His will takes its guidance from sympathy with the exerted will of the other. 4. Presently, if his trance-faculties continue to be developed, the entranced person enters into communication with the entire mind of his mesmeriser. His apprehension seems to penetrate the brain of the latter, and is capable of reading all his thoughts.