The human voice is that sound, caused by the vibration of the vocal cords in the larynx and reinforced by the resonant chambers, which reports the physical and mental states of man.

CAUSE OF VOICE.

Voice is caused by the contraction of the muscles of expiration, which brings sufficient pressure upon the lungs to drive the air from them out between the vocal cords, thus causing their edges to vibrate, thereby throwing the column of breath into such rapid vibration as to produce sound.

ORGANS THAT PRODUCE VOICE.