SPEECH. 493 



3. Resonants are the sounds which require some resonance of 

 the vocal cords, and the air current is suddenly checked by clos- 

 ure of the lips, as in m, or the dental aperture as in n or ng. 



4. Vibratory, of which r is the example, requires a peculiar 

 vibration of the vocal cords, while either the dental or the gut- 

 tural aperture is partially closed. 



