OF THE VOICE AND SPEECH. 99 



SECT. IX. 



OF THE VOICE AND SPEECH. 



152. \VE have described the chief use of respiration. 

 We shall hereafter mention how far it contributes to the 

 conversion of the chyle into blood, and to the support 

 of almost the whole class of natural functions. Its 

 other uses are at present to be considered. 



And first, respecting the voice* This takes place 

 after birth, and proceeds from the lungs, as was ob- 

 served long ago by Aristotle, who called those animals 

 only vocal, which breathed by means of lungs. The 

 voice is, properly speaking, a sound, formed, by means 

 of expiration, in the larynx, which is a most beauti- 

 fully constructed organ, fixed upon the top of the 

 windpipe, like a capital upon a pillar.f 



153. The larynx is composed of various cartilages, 

 which being united together in the form, as it were, 

 of a little box, J and supplied with a considerable and 

 wonderful apparatus of muscles, may be moved alto- 

 gether, or separately, according to the variations of 

 the voice. 



* Th. Young, Philos. Trans. 1800. P. 1. 



f Jan. Marg. Busch, De Mechanismo organi Vocis hvjusque funct'iorte. 

 Groning. 1770. 4to. 



J Soemmerring, Iconcs organorum Gustus et Vocis. Francof. 1808. fol. 



B. S. Albinus, Tab. Muscul. Tab. X. fig. 115. Tab. XI. fig. 4548. 

 Tab. XII. fijr. 17. 



ji '2 



