Animal Magnetism.--Somnambules.--Magnetised Patients.--My own Examination.--A Prediction.--Ventriloquism.--Force of the Imagination. To JAMES E. DE KAY, M.D. Although we have not been without our metaphysical hallucinations in America, I do not remember to have heard that "animal magnetism" was ever in vogue among us. A people who are not very quick to feel the poetry of sentiment, may well be supposed exempt from the delusions of a doctrine which comprehends the very poetry of physics. Still, as the subject is not without interest, and as chance has put me in the way of personally inquiring into this fanciful system, I intend, in this letter, to give you an account of what I have both heard and seen. I shall premise by saying that I rank "animal magnetism" among the "arts" rather than among the "sciences." Of its theory I have no very clear notion, nor do I believe that I am at all peculiar in my ignorance; but until we can say what is that other "magnetism" to which the world is indisputably so much indebted for its knowledge and comforts, I do not know that we are to repudiate this, merely because we do not understand it. Magnetism is an unseen and inexplicable influence, and that is "metallic," while this is "animal;" _voila tout_. On the whole, it may be fairly mooted which most controls the world, the animal or the metallic influence. To deal gravely with a subject that, at least, baffles our comprehension, there are certainly very extraordinary things related of animal magnetism, and apparently on pretty good testimony. Take, for instance, a single fact. M. Jules Cloquet is one of the cleverest practitioners of Paris, and is in extensive business. This gentleman publicly makes the following statement. I write it from memory, but have heard it and read it so often, that I do not think my account will contain any essential error.