THE VOICE 355 



the larynx and of the nose and teeth. Explain that these vibrations 

 also produce sound and give quality to the sound in the larynx. Then 

 compress the nose and note the nasal quality of the voice. 



1 53. Show how the different vowel sounds are formed. Make a con- 

 tinuous sound as of e in need. Without changing the pitch or intensity 

 change the mouth to a position to utter in succession the sounds a as 

 in made, a as in mat, ah as in father, o as in note, and oo as in room. 

 Note how the sounds glide into each other. 



154. Note the positions of the tongue and lips in uttering the 

 different consonant sounds. Note that p, b, and f are formed much 

 alike ; and also k, ch, and^; and /, d, and th. 



155. Show how some lower animals and insects produce sounds. 

 Have the pupils notice how a canary bird swells his throat in singing, 

 and explain that this is because it has two or three pairs of vocal cords. 



Upon the backs of a katydid's wings show the drumheads, which, 

 when rubbed together, produce its sound. Show that a fly's buzz is 

 due to the exceedingly rapid motion of its wings. 



REVIEW TOPICS 



1. Describe the larynx. 



2. Show how the vocal cords produce sound. 



3. Show how \hzpitch of the voice can be changed. 



4. Show how the intensity of the vocal sounds can be 



changed. 



5. Show how the quality of the voice is modified. 



6. Describe ventriloquism. 



7. Show that speech depends upon modifications in the 



duration and mode of production of vocal sounds. 



8. Show the relation between speech and hearing. 



9. Show that the tongue is not absolutely necessary in 



speech. 



10. Show how vocal exercise benefits the whole body. 



11. Show how inflammation of the larynx and taking 



certain things into the mouth injure the voice. 



