CHAPTER XIV 



THE VOICE 



134. THE human voice is produced by the 

 vibrations of the margins of two ligaments in 

 the larynx called the vocal cords. Voice 

 should be distinguished from speech. Many of 

 the lower animals have voice, but none have 

 the faculty of speech in the same sense as we 

 find it in man. There may be speech with- 

 out voice as in whispering, while in singing a 

 musical scale we have voice without speech. 



135. The apparatus for the production of 

 voice consists of (a) a wind chest, the thorax, 

 by means of which a blast of air may be forced 

 from the lungs through the windpipe or 

 trachea to the larynx ; (b) a sound box, the 

 larynx, containing the vocal cords ; and (c) 

 the throat, mouth, and nasal, and other pas- 

 sages that modify the sound produced in the 



larynx. Voice is almost invariably produced 

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