John Delaware Lewis, Once a Week (1860)
“ Spirits were ordered to rap on the walls, and inside the piano, which they entirely failed to do, rapping all the time unmistakeably under the table, with slight variations of sound. And every time that one of these raps was produced, it was impossible for the younger medium to repress a slight, almost imperceptible, movement of the body, showing plainly that they were caused by her: even if this could for a moment be doubted, after a second request from us that she would leave the table, and suffer us to hear so much as a single rap when she was not there, which she again refused to do. ”
