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organs suddenly become evolved, as though nature had wished to inform 

 him, that it is through them he is to express his desires to the gentle be- 

 ing who may sympathize in them. The voice, therefore, serves as a na- 

 tural connexion between the external functions, and those which are em- 

 ployed in the preservation of the human species. 



The voice, which leads so naturally from the functions which establish 

 our external relations, to those whose end is the preservation of the spe- 

 cies, is still more intimately connected with motion. It is, in a manner, 

 the. complement of the phenomena of locomotion ; by means of it, our com- 

 munication with external objects is rendered easier, more prompt, and 

 more extensive : it depends on muscular action, and is the result of vo- 

 luntary motion. Finally, these motions sometimes supply the place of 

 speech, in pantomime, for example, and in the greater number of cases, 

 the language of action concurs in adding to its effect. Every thing-, there- 

 fore, justifies me in placing this function after motion, in separating it 

 from respiration, with which every other author has joined it, without 

 considering that the relation between the voice and respiration is purely 

 anatomical, and can, therefore, in nowise apply to physiology. 



I have placed after generation, an abridged account of life and death, 

 in which will be found, whatever did not belong to any of the preceding 

 divisions. The necessity of this appendix, containing the history of the 

 different periods of life, that of the temperaments and varieties of the hu- 

 man species, that of death and putrefaction, arises from the impossibility 

 of introducing into the particular history of the functions, these general 

 phenomena in which they all participate. 



