notice, having heard much of the extraordinary performances we went in company with a scientific friend to see for ourselves. The medium was a sprightly young girl, whose reputation for sincerity might have been her dearest treasure. The wonderful feats of this medium were recounted to us, and we longed for the verification. After a brief conversation, she with another young lady, (about half medium) placed hands upon a small table, our friend joining the circle. Their hands were so placed, that the right hand of one concealed the left hand of the other. After a while, the table began to move. This was natural, certainly, for we noticed that this medium was working very hard with her concealed hand to move it. Perhaps her mother saw this, for she rose from her seat and said, "You are not tricking, now?" "No, indeed, mother, I'm not tricking; see how lightly I _press_!" What a comment was all this upon the recital just made by her mother to us of the astonishing feats of moving heavy dining-tables, tearing up the carpets, moving pianofortes, &c.! Our friend beginning to suspect the voluntary character of this motion of the table, made a counter effort with his fingers (better concealed than that of the medium for the reason that he was possessed of far greater strength), and the table stopped moving. But this was not all. We detected upon the countenance of the medium an expression of disappointment, and further, a more palpable striving to move the table, in consequence of this resistance, which she seemed not to suspect. All this seems too farcical to relate, and yet the _superhuman_ performances of this very medium had been described to us by eye-witnesses of the highest respectability as marvellous, and astounding in the extreme, and our principal informant was a gentleman well known for his astuteness, had some years back published an excellent work upon mathematics, and was as well qualified as the average of learned men to observe and decide upon such matters. His testimony was confirmed by several others, all witnesses of the highest respectability, and what was it all worth? and what is all other testimony worth upon this _aerial vaulting_ of tables? Perhaps we are mistaken as to the effort made by this medium to move the table. Let us see! We placed a sheet of paper on the table under her hand, and as soon as the table was desired to move, behold the sheet of paper moved over the table-top, while the table stood still. Here is the demonstration of this fallacy, and although in such a shape that it may be cavilled at, yet it is, however, the elementary key, and to us all-sufficient in itself. We will, however, develope it in such form as to be beyond all cavil. We witnessed, after this, many abortive attempts by mediums and others to move tables, and some other attempts that began to succeed, till we applied our mechanical tests, when the new fluid, electricity, magnetism, nervous power, odylic force, all