The editor of the Spiritual Telegraph says, that "in the biological experiments there is a _visible human operator_," but, "in the spiritual manifestations, no human operator can be found, or demonstrated to exist." But, pray, what is the "medium," in these manifestations, but _a visible human operator_? Sometimes it takes three or four persons to produce a single demonstration. And sometimes they cannot muster _force_ enough to do this, especially if the weather be rainy. And this is probably the reason why the rappers at Poughkeepsie have resolved not to admit unbelievers, nor at any time more than two or three new-comers, at a "circle," making, with the believers, ten or twelve in all--successful results never being guarantied to those invited to attend. Mr. Brittan himself asserts that it is "the same power that moves the _human medium_ that also moves the _wooden table_," &c. Here we have a _human medium_ that is _moved to do something_, and _wooden tables_, also; and if we can discover the secret agent in the one case, we shall likewise in the other, for there is a perfect sameness or coincidence in their operations. It is the same _unseen_ power, in both cases, moving chairs, tables, tubs, troughs, bedsteads, and piles of lumber, besides other gross, ponderable bodies--cutting up an infinite variety of pranks to the _consternation_ of some, and the _amusement_ of others, as A. J. Davis says of the dancing plates, knives and forks, shovel, tongs, and poker, moved by "electrical discharges and magnetic attractions," or emanations of vital electricity seeking its equilibrium in the atmosphere. FACULTY OF IMITATION. The faculty of imitating signatures, of writing music, poetry, specimens of foreign tongues, &c., is no more strange than imitating the voice and gestures of those we never heard nor saw. Persons of scarcely any education or talents, while under biological influence, have been made to imitate the voice of Webster, Everett, Fillmore, and others, delivering off-hand speeches of most impassioned diction and eloquence; while, in their _normal_ state, they could scarcely frame a paragraph in the king's English, much more deliver a formal address, embellished with a profusion of metaphors, tropes, and figures, accompanied with the finished attitudes and movements of a Choate, a Sumner, or a Banks! These mesmeric imitations refer also to mechanical and artistic power, and every talent that characterizes us as intelligent beings. Some assert that mediums are in a _perfectly normal state_ during the exhibitions of the "spirit" phenomena; and yet, to the practical mesmerizer, nothing is plainer than that they are most absolutely mesmeric persons.