"I have not examined into those doctrines, nor seen with my own eyes the wonders recorded, upon evidence too respectable, nevertheless, to permit me peremptorily to deny what I have not witnessed.[2] But wherever I look through the History of Mankind in all ages and all races, I find a concurrence in certain beliefs which seem to countenance the theory that there is in some peculiar and rare temperaments a power over forms of animated organization, with which they establish some unaccountable affinity; and even, though much more rarely, a power over inanimate matter. You are familiar with the theory of Descartes, 'that those particles of the blood which penetrate to the brain do not only serve to nourish and sustain its substance, but to produce there a certain very subtle Aura, or rather a flame very vivid and pure, that obtains the name of the Animal Spirits;'[3] and at the close of his great fragment upon Man, he asserts that 'this flame is of no other nature than all the fires which are in inanimate bodies.'[4] This notion does but forestall the more recent doctrine that electricity is more or less in all, or nearly all, known matter. Now, whether in the electric fluid or some other fluid akin to it of which we know still less, thus equally pervading all matter, there may be a certain magnetic property more active, more operative upon sympathy in some human constitutions than in others, and which can account for the mysterious power I have spoken of, is a query I might suggest, but not an opinion I would hazard. For an opinion I must have that basis of experience or authority which I do not need when I submit a query to the experience and authority of others. Still, the supposition conveyed in the query is so far worthy of notice, that the ecstatic temperament (in which phrase I comprehend all constitutional mystics) is peculiarly sensitive to electric atmospheric influences. This is a fact which most medical observers will have remarked in the range of their practice. Accordingly, I was prepared to find Mr Hare Townshend, in his interesting work,[5] state that he himself was of 'the electric temperament,' sparks flying from his hair when combed in the dark, etc. That accomplished writer, whose veracity no one would impugn, affirms that between this electrical endowment and whatever mesmeric properties he might possess, there is a remarkable relationship and parallelism. Whatever state of the atmosphere tends to accumulate and insulate electricity in the body, promotes equally' (says Mr. Townshend) 'the power and facility with which I influence others mesmerically.' What Mr. Townshend thus observes in himself, American physicians and professors of chemistry depose to have observed in those modern magicians, the mediums of (so-called) 'spirit manifestation.' They state that all such mediums are of the electric temperament, thus everywhere found allied with the ecstatic, and their