"I went one summer morning to see an old man who lived in the Marylebone Road. I was shown up into a sunny little room on the first floor. It had neither carpet, curtains nor window blind, and it looked on the street. The furniture consisted of a plain, uncovered deal table in the middle of a clean planked floor, and eight plain uncovered deal chairs were ranged round the walls... "Please make those four chairs opposite to us cross the floor and mount on to the table," I said. The old man drew his chair quite close to mine, "Then give me your hand." I removed my glove and did as he asked... "I am not a hypnotist, but I see you have power. You may as well lend me some. You are young, and I am old.".. At that second my attention was distracted by a grating sound... I saw the four chairs leave the wall and advance towards the table... There appeared to be four invisible hands at the work. Then, one by one, they were neatly balanced, one on the top of the other, on the table... "Good boys! good boys," I heard him murmur. "How is it done?" I asked him. He shrugged. "The Petris (spirits) do it..." "Then ask 'the Petris' to put the chairs neatly back again." "The Petris" performed this feat very expeditiously...There was no loophole here for fraud, not a wire, or string, or any human manipulation..."