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THE VIBRATORY APPARATUS.
10. Definition of Voice.—Voice primarily consists of sounds produced by the vibration of the vocal cords. The vocal cords are two elastic bands stretching from the front to the back of the throat in the middle of a prominence (called Adam's apple) situated in the neck about half way between the jaw and the top of the breastbone. The breath leaving the lungs in expiration passes through the narrow chink left between the two vocal cords when they are brought close together for voice; while passing through this small space the breath makes the cords vibrate, the vibration of the cords is communicated to the breath itself, which now becomes a vibrating column of air from the bottom of the chest to the end of the air passages. This vibrating column of air is ivhat is called voice.
The organs employed in the process comprise the Vocal Organs proper—the vibrating element, the Breathing Organs—the motive element, and the Resonating Cavities—the modifying element. The structure and use of these organs will be described in the order here mentioned.
11. The Larynx.—The larynx or voice-box, as it is sometimes called, is composed of cartilages which are joined together by fibrous bands and membranes so as to