.A YEAR IN SCIENCE 



105 



Egg-white 



Milk 



Potato 



Apple 



Beans ( soaked ) 



English walnuts 



Flour 



Apparatus 



Iodine 

 Nitric acid 

 Fehling's solution 

 Ammonia 

 Unglazed paper 

 Bunsen burner 



Directions: Apply the four tests, which you have 

 learned in Exercise 69, to each of the following foods 

 and tabulate your results as follows : 



CHAPTER XVII 



DIGESTIVE SYSTEM 



Exercise 71. Study of the Mouth (home study). 

 Object: To study the parts and structure of the 

 mouth. 



Apparatus 



Hand mirror 



Directions: Take a position with your back toward 

 a strong light, and study your mouth cavity with the 

 aid of a hand mirror. 



