342 THE HUMAN BODY- 



IS made to rush through a narrow aperture, as, for ex- 

 ample, between the lips (f) or the teeth (s) or the tongue 

 and the palate (sh) or the tongue and the teeth (th); 

 (2) resonants or semivowels; (3) vibratories, the different 

 forms of r, due to vibrations of parts bounding a constric- 

 tion put in the way of the air-current on its passage. 



