In the corner of the hall there was a piano, placed to the left of Ochorowicz and Eusapia, and a little in the rear. Some one desired to hear the keyboard touched. We at once hear the moving of the piano. Ochorowicz can even see the displacement, thanks to a ray of light which falls upon the polished surface of the instrument through the window shutters. The piano then opens noisily, and we hear the bass notes of the keyboard sounding. I utter aloud my desire to hear high notes and low notes touched at the same time, as a proof that the unknown force can act at the two ends of the keyboard. My wish is granted, and we hear bass notes and treble notes sounded at the same time, which seems to prove the action of two distinct hands. Then _the instrument advances toward us_. It presses against our group, and we are obliged to get up and move back with our experiment table, and we do not stop until we have thus moved back several yards. A glass half full of water, which stands on a buffet, out of reach of our hands, was carried by an unknown power to the lips of Ochorowicz, Eusapia, and another person, who all drank of it. This performance took place in complete darkness and with astonishing precision. We were able to prove the existence of a real hand not belonging to any one present. We did it by means of the plaster cast and mould, as follows: Having placed a heavy basin filled with modelling-clay upon the large table in the middle of the dining-room, we sat down with Eusapia around the little experiment-table more than a yard distant. After some minutes of waiting, the basin came of itself and stood on our table! Eusapia groaned, writhed, and trembled in all her limbs; yet not for a moment did her hands quit ours. Then she cried, "_E fatto_" ("It is done"). The candle is lighted again, and we find an irregular hollowed place upon the surface of the clay. This hollow place, afterward filled with plaster, gives us a perfect cast of the contracted fingers of a hand. We placed upon the table a plate smeared with lampblack. The mysterious hand left there the print of the end of its fingers. The hands of the experimenters, including those of Eusapia, _remained white_. We next induced the medium to reproduce the impression of her own hand upon another lamp-smoked plate. She did so. The layer of soot removed by her fingers had deeply blackened them. A comparison of the two plates enabled us to prove a striking resemblance,--that is to say (to speak more accurately), the identity of the arrangement of the spiral circles in the epidermis of the two hands; and we know that the arrangement of these circles is unique in every individual. This is a particular which speaks eloquently in favor of the hypothesis of the double personality of the medium.