I had met the young stranger by whom I had been so favourably impressed, I was up as usual, a little before the sun, and long before any of my servants were astir. I went first into the room I have mentioned, and which I shall henceforth designate as my study, opened the window, unlocked the gate, and sauntered for some minutes up and down the silent lane skirting the opposite wall, and overhung by the chestnut-trees rich in the garniture of a glorious summer; then, refreshed for work, I re-entered my study, and was soon absorbed in the examination of that now well-known machine, which was then, to me at least, a novelty,--invented, if I remember right, by Dubois-Reymond, so distinguished by his researches into the mysteries of organic electricity. It is a wooden cylinder fixed against the edge of a table; on the table two vessels filled with salt and water are so placed that, as you close your hands on the cylinder, the forefinger of each hand can drop into the water; each of the vessels has a metallic plate, and communicates by wires with a galvanometer with its needle. Now the theory is, that if you clutch the cylinder firmly with the right hand, leaving the left perfectly passive, the needle in the galvanometer will move from west to south; if, in like manner, you exert the left arm, leaving the right arm passive, the needle will deflect from west to north. Hence, it is argued that the electric current is induced through the agency of the nervous system, and that, as human Will produces the muscular contraction requisite, so is it human Will that causes the deflection of the needle. I imagine that if this theory were substantiated by experiment, the discovery might lead to some sublime and unconjectured secrets of science. For human Will, thus actively effective on the electric current, and all matter, animate or inanimate, having more or less of electricity, a vast field became opened to conjecture. By what series of patient experimental deduction might not science arrive at the solution of problems which the Newtonian law of gravitation does not suffice to solve; and--But here I halt. At the date which my story has reached, my mind never lost itself long in the Cloudland of Guess. I was dissatisfied with my experiment. The needle stirred, indeed, but erratically, and not in directions which, according to the theory, should correspond to my movement. I was about to dismiss the trial with some uncharitable contempt of the foreign philosopher’s dogmas, when I heard a loud ring at my street-door. While I paused to conjecture whether my servant was yet up to attend to the door, and which of my patients was the most likely to summon me at so unseasonable an hour, a shadow darkened my window. I looked up, and to my astonishment beheld the brilliant face of Mr. Margrave. The sash to the door was already partially opened; he raised it higher, and walked into the room. “Was it you who rang at the street-door, and at this hour?” said I.