The Fox girls visit the houses of strangers and rap always with the same ease every where. The raps are never remote from their persons but always directly about their feet, unless it be when they are sitting at the table, as we have before said, when the rap appears to be on the under side of the table-top, although we would not undertake to decide fully upon this latter point, as they would not allow us to choose our position so as to judge of the true direction of the sound; for as soon as my coadjutor looked under the table, the spirits decamped and we had no rapping. There are certain circumstances, under which no ear, however skilful and practised, can judge correctly of the position or distance where certain sounds originate. Such a case is exemplified in the common speaking tubes used in public houses and elsewhere. When you place your ear near the tube, the voice appears to be uttered close to the ear, though the person speaking may be at a great distance. The Invisible Lady is another instance, for a full account of which, see Brewster's work on Natural Magic. But the most remarkable illustration of this case is exhibited in the following manner. If you take an iron rod ten, twenty, fifty, or one hundred feet in length and strike it at one end, the blow is heard by a person having his ear close at the other end precisely as if the blow was struck near his ear. This illusion is more remarkable if the listener cannot hear the original blow through the medium of the air. To make the whole experiment very imposing, suppose an iron rod, three-fourths of an inch in diameter, projecting three or four feet through the floor of a large hall, and that this projecting part is a continuation of a rod passing beneath the floor of the room, and concealed entirely from observation and terminating out of doors, or in a distant apartment. Whenever a blow is struck upon the remote and concealed end, the sound not being heard except through the medium of the rod, appears to every person present, precisely as if it issued from the projecting end within the hall. With proper pre-concertion and ceremonial preparation, such a contrivance as this would far exceed, in mysterious character, the shallow trickery of these _feet-rappers_. From this experiment, which we have tried with entire success with a rod only twenty feet in length, we see how closely we must look to all the attendant circumstances and possibilities of the case, before we can conclude strictly upon the position of the origin of sounds, where their origin is out of sight. We know that the rapping was always about their _heels_ when these girls sat in chairs, stood upon the floor, or in chairs, or stood in the wardrobe, or rapped upon the door. For this part of the performance we had abundant opportunities for examination, and if these girls will stand upon the floor and allow us to examine their feet, at the time of the rapping, we defy them and their spirits to produce the rappings