MANDAI, OF NATURE STUDY. 75 



3. Care of the throat. Show that the apparatus 

 for the voice is in the throat. 



Illustrate by chalk box or other device with fine 

 strings stretched and fastened across the top. Pick 

 the strings between the fingers as you would a banjo. 

 Notice the change in sound when the strings are 

 tightened or loosened. A violin, banjo or guitar will 

 be a still better illustration. In either case the 

 makingof a new sound requires change of fingering, 

 tightening or loosening of the string. 



What produces the change of sound in our 

 voices ? While singing the musical scale let the 

 children place their hands upon their own throats 

 and observe the muscular changes that take place. 

 With a severe cold could these muscular changes 

 be made as easily ? If the strings of a violin were 

 covered with a sticky substance would they give us 

 as clear a sound? When the vocal cords are 

 covered with phlegm, as they must be during a 

 severe cold, can you speak as clearly ? What tubes 

 belong in the region of the throat? (The tube 

 which leads to the lungs and the one to the stomach, 

 — ^two very important ones). If the trachea be in- 

 flamed, what effect upon our breathing? It pro- 

 duces a cough which only adds to the inflammation, 

 and is otherwise very disagreeable, not only to our- 

 selves but to others, A heavy cold will often cause 



