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You know my tract on The Cardinal Functions of the Brain. I there, by the evidence of innumerable facts, prove, as I think, the high probability of a circulation arterial and venous in its mechanism, through the nerves. Of this system, thus considered, the brain is the heart. The fluid, which is propagated hence through one class of nerves, returns in an altered state through another, and the nature of that fluid is spiritual, though not immaterial, any more than, as I before remarked, light or electricity are so.

By various abuses, among which the habitual use of such agents as green tea is one, this fluid may be affected as to its quality, but it is more frequently disturbed as to equilibrium. This fluid being that which we have in common with spirits, a congestion found upon the masses of brain or nerve, connected with the interior sense, forms a surface unduly exposed, on which disembodied spirits may operate: communication is thus more or less effectually established. Between this brain circulation and the heart circulation there is an intimate sympathy. The seat, or rather the instrument of exterior vision, is the eye. The seat of interior vision is the nervous tissue and brain, immediately about and above the eyebrow. You remember how effectually I dissipated your pictures by the simple application of iced eau-de-cologne. Few cases, however, can be treated exactly alike with anything like rapid success. Cold acts powerfully as a repellant of the nervous fluid. Long enough continued it will even produce that permanent insensibility which we call numbness, and a little longer, muscular as well as sensational paralysis.