"Home's mysterious power, whatever it may have been, was very uncertain. Sometimes he could exercise it, and at others not, and these fluctuations were not seldom the source of embarrassment to him. He would often arrive at a place in obedience to an engagement, and, as he imagined, ready to perform, when he would discover himself absolutely helpless. After a séance his exhaustion appeared to be complete. "There is no more striking proof of the fact that Home really possessed occult gifts of some sort--psychic force or whatever else the power may be termed--than he gave such amazing exhibitions in the early part of his history and was able to do so little toward the end. If it had been juggling he would, like other conjurors, have improved on his tricks by experience, or at all events, while his memory held out he would not have deteriorated." Dr. Hammond's Experiments. Dr. William A. Hammond, the eminent neurologist, of Washington, D. C., took up the cudgels against Prof. Crookes' "Psychic Force" theory, and assigned the experiments to the domain of animal electricity. He wrote as follows:[2] "Place an egg in an egg-cup and balance a long lath upon the egg. Though the lath be almost a plank it will obediently follow a rod of glass, gutta percha or sealing-wax, which has been previously well dried and rubbed, the former with a piece of silk, and the two latter with woolen cloth. Now, in dry weather, many persons within my knowledge, have only to walk with a shuffling gait over the carpet, and then approaching the lath hold out the finger instead of the glass, sealing wax or gutta percha, and instantly the end of the lath at L rises to meet it, and the end at L is depressed. Applying these principles, I arranged an apparatus exactly like that of Prof. Crookes, except that the spring balance was such as is used for weighing letters and was therefore very delicate, indicating quarter ounces with exactness, and that the board was thin and narrow. [Illustration: FIG. 21. DR. HAMMOND'S APPARATUS.] "Applying the glass rod or stick of sealing-wax to the end resting by its foot on the table, the index of the balance at once descended, showing an increased weight of a little over three quarters of an ounce, and this without the board being raised from the table. "I then walked over a thick Turkey rug for a few moments, and holding my finger under the board near the end attached to the balance, caused a fall of the index of almost half an ounce. I then rested my finger lightly on the end of the board immediately over the foot, and again the index descended and oscillated several times, just as in Mr. Home's experiments. The lowest point reached was six and a quarter ounces, and as the board weighed, as attached to the balance, five ounces, there was an increased weight of one and a quarter ounces. At no time was the end of the board raised from the table.