308 PHYSIOLOGY. 



Experiments have been made upon the sense of hearing 

 which show that alcohol in small quantities injures this 

 sense as it does others. 



What sound communicates to us the most of thought 

 and sympathy ? 



What sound was it Robinson Crusoe, in his dreary soli- 

 tude, most longed to hear ? 



READING. The Physiology of the Senses, M'Kendrick 

 and Snodgrass. 



Summary. i . Taste enables us to judge of the quality of food, 

 and it indirectly influences digestion. 



2. The tongue has two nerves of taste, the fifth pair of cranial nerves 

 supplying the front, and the ninth pair the base. 



3. So-called flavors affect the sense of smell more than that of taste. 



4. The sense of smell tests food and air. 



5. Agreeable odors promote respiration. 



6. The ear consists of the outer, middle, and inner ear. In the inner 

 ear are the endings of the auditory nerve. 



7. The semicircular canals have to do with a sense of equilibrium 

 and not with hearing. 



8. Colds and catarrh often seriously affect hearing. 



Questions. i. How may the sense of taste be blunted ? 



2. What is the effect of inhaling menthol ? 



3. Does a person who is deaf in one ear hear "half as well" a? 

 before ? 



4. Which of the senses goes to sleep first when we go to bed ? 



5. In what order do the other senses go to sleep ? 



6. In what order do the senses waken in the morning ? 



