"_The two females were seated upon two chairs placed near together, their heels resting on cushions, their lower limbs extended, with the toes elevated and the feet separated from each other._ The object of this experiment was to secure a position in which the ligaments of the knee-joint should be made tense, and no opportunity offered to make a pressure with the foot. _We were pretty well satisfied that the displacement of the bones requisite for the sounds could not be effected, unless a fulcrum were obtained by resting one foot upon the other, or on some resisting body. The company waited half an hour, but no sounds were heard in this position._ "The position of the _younger_ sister was then changed to a sitting posture, with the lower limbs extended on the sofa, _the elder sister sitting in the customary way_, at the other extremity of the sofa. The 'Spirits' did not choose to signify their presence under these circumstances, although repeatedly requested to do so. The latter experiment went to confirm the belief that the _younger sister alone_ produced the 'rappings.' These experiments were continued until the females themselves admitted that it was useless to continue any longer at that time, with any expectation of manifestations being made. "_In resuming the usual position on the sofa, the feet resting on the floor, the knockings soon began to be heard._" Then the doctors held the knees of the fair performers to ascertain if there was any movement when the sounds were heard: "The hands were kept in apposition for several minutes at a time, and the experiments repeated frequently, for the space of half an hour and more, with negative results; that is to say, _there were plenty of 'raps' when the knees were not held, and none when the hands were applied, save once; as the pressure was intentionally relaxed (Dr. Lee being the holder) two or three faint single 'raps' were heard, and Dr. Lee immediately averred that the motion of the bone was plainly perceptible to him. The experiment of seizing the knees as quickly as possible, when the knockings first commenced, was tried several times, but always with the effect of putting an immediate quietus upon the demonstrations_." No sensible person can doubt that the statements of facts within their actual knowledge, made by these three eminent physicians, are absolutely true. They say finally: "_Had our experiments, which were first directed to this joint failed, we should have proceeded to interrogate, experimentally, other articulations. But the conclusions seemed clear that the 'Rochester knockings' emanate from the knee-joint._" What a pity they did _not_ "interrogate" other articulations!