The “catch” B moves the paper on which the tune is “perforated,” when the bellows is empty, the other catch when it is distended; but a counter catch, D, represented by the dotted lines in the illustration, is so arranged that the paper cannot pass on except the tooth of the catch D is opposite a hole pierced upon the plate above. In the contrary case there is no movement of the paper during the dilatation of the bellows. The effect of this very ingenious arrangement is to give to the “musical” band of “board” an irregular movement, but it economises it in the case of sustained notes. The whole action of the instrument depends upon the correct working of the bellows. The effect, from an artistic point of view, certainly leaves something to be desired, but the instrument is cheap, and not cumbersome, and the slips of paper upon which the music is “cut out” can be made by machinery, and consequently are not dear. So far, the Autophone is fitted for popular favour and use, and may supersede the barrel organ. [Illustration: Fig. 187.—Detail of the Autophone.] The AUDIPHONE is an instrument to conduct sound to the ear, to supplement it when temporary or partial deafness has occurred. Very likely many of our readers have observed ladies carrying large black fans on occasions,—at church, or lecture, or theatre,—and wondered why, perhaps. Those “fans” are Audiphones. The instrument is made of vulcanized rubber, and consists of a long flexible disc supported by a handle. To the upper edge of the “fan” are attached cords, which pass through a clip on the handle. If the person who wishes to hear by means of the Audiphone will hold the fan against the upper teeth,—the convex side of the fan outward,—he or she will hear distinctly, for the vibrations of sound are collected and strike upon the teeth and bones, and act upon the auditory nerves from within, precisely as the vibrations act from without through the auricle. We need hardly add that if the ear be injured the Audiphone will be of no use. A writer says: “From personal observation with the Audiphone it appears to convey the sonorous vibrations to the ear through the teeth, just as a long wooden rod held in the teeth will convey the vibrations of the sounding-board of a piano, though the piano is in another room and out of hearing by the ear. In using the Audiphone during conversation there is no movement or vibration felt by the teeth; in listening to a piano there is a very faint sensation as if the Audiphone vibrated slightly, while with the handle of the Audiphone resting on the sounding-board of the piano the vibrations are so violent as to be painful to the teeth. By closing the ears a person with even acute hearing can observe the admirable manner in which the instrument conveys spoken words to the ear. The Audiphone will prove to be of great value to deaf mutes, as it enables them to hear their own voices, and thus to train them