In order to understand what part this indecision of the ear performs in the feats of the ventriloquist, let the reader suppose two men placed before him in the open air, at the distance of one hundred feet, and standing close together. If they speak in succession, and if he does not know their voices, or see their lips move, he will be unable to tell which of them it is that speaks. If a man and a child are now placed so near the auditor that he can distinguish, without looking at them, the direction of the sounds which they utter, that is, whether the sound comes from the right or the left hand person, let the man be supposed capable of speaking in the voice of a child. When the man speaks in the language and the accents of the child, the auditor will suppose that the child is the speaker, although his ear could distinguish, under ordinary circumstances, that the sound came from the man. The knowledge conveyed to him by his ear is, in this case, made to yield to the more forcible conviction that the language and accents of a child could come only from the child; this conviction would be still further increased if the child should use gestures, or accommodate his features to the childish accents uttered by the man. If the man were to speak in his own character and his own voice, while the child exhibited the gestures and assumed the features which correspond with the words uttered, the auditor might be a little puzzled; but we are persuaded that the exhibition made to the eye would overpower his other sources of knowledge, and that he would believe the accents of the man to be uttered by the child: we suppose, of course, that the auditor is not allowed to observe the _features_ of the person who speaks.
In this case the man has performed the part of a ventriloquist, in so far as he imitated accurately the accents of the child; but the auditor could not long be deceived by such a performance. If the man either hid his face or turned his back upon the auditor when he was executing his imitation, a suspicion would immediately arise, the auditor would attend more diligently to the circumstances of the exhibition, and would speedily detect the imposition. It is absolutely necessary, therefore, that the ventriloquist shall possess another art, namely, that of speaking without moving his lips or the muscles of his face: how this is effected, and how the art is acquired, we do not certainly know; but we believe that it is accomplished by the muscles of the throat, assisted by the action of the tongue upon the palate, the teeth, and the inside of the lips--all of them being movements which are perfectly compatible with the immutability of the lips themselves, and the absolute expression of silence in the countenance. The sounds thus uttered are necessarily of a different character from those which are produced by the organs of speech when unimpeded, and this very circumstance gives double force to the deception, especially when the ventriloquist artfully presents the contrast to his auditor by occasionally speaking with his natural voice. If he carries in his hand those important personages Punch and Judy, and makes their movements even tolerably responsive to the sentiment of the dialogue, the spectator will be infinitely more disposed to refer the sounds to the lantern jaws and the timber lips of the puppets than to the conjurer himself, who presents to them the picture of absolute silence and repose.