88 LABORATORY EXERCISES. 



time. What impression do you receive in re- 

 gard to your nose? 



46. SENSATIONS OF TASTE AND SMELL. 



Materials: Potato, onion, apple, spices, flavoring extracts, sugar, 

 salt, mustard, quinine solution, vinegar. 



A. Flavors of substances. 



1. Secure a bit of potato, a bit of onion, and a 



bit of apple; close your eyes and hold 

 your nose tightly ; place each of the three 

 in your mouth successively. Can you 

 distinguish by taste alone one piece from 

 the others? 



2. Keeping the eyes closed, repeat the experi- 



ment without holding the nose. 



a. Can the foods be distinguished now? 



b. What do these experiments teach you 



in regard to the real nature of what 

 is commonly thought to be the 

 taste of certain foods? 



c. Why are many foods tasteless to a per- 



son with a cold in the head? 



d. What method of taking disagreeable 



medicines is suggested by these ex- 

 periments ? 



3. Close your eyes and hold your nose; experi- 



ment with spices, sugar, salt, mustard, 

 quinine solution, vinegar, peppermint, 

 vanilla, etc. Record your results as fol- 

 lows: 



