3 02 



GENERAL SCIENCE 



The mouth should be well opened while speaking or sing- 

 ing, the soft palate elevated, and the lips moved with 

 firmness. A mouth-breather can never develop a clear, 

 sweet voice, because the vocal cords are affected by the 



Branches 

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Cochlea 



Eustachfon 



^ ,.___" tube 



DIAGRAM or SECTION THROUGH THE HUMAN EAR 



cold air and dust which reach them by such breathing. 

 A person who has not learned to breathe through the nose 

 cannot sing or speak very long without becoming hoarse. 

 The teeth also play an important part in singing and speak- 

 ing by their resonant and modulating effect. To have a 

 good voice for singing, good teeth are usually necessary. 



208. The Ears. The ear consists of three principal 

 parts, namely, the external ear, the middle ear, and the 

 internal ear. The external ear, which is visible on the 

 side of the head, is more or less folded so that it can 

 catch the sound waves and reflect them toward or into 

 the ear-tube, called the auditory canal, which is about 

 an inch long. The inner end of this canal is closed by 

 a membrane called the tympanic membrane or ear- 



