262 INTRODUCTION TO GENERAL SCIENCE 



b. Put some more chopped egg in another test tube and 

 cover with half water and half 10 per cent hydrochloric acid. 

 This gives a 5 per cent solution. What is the result after two 

 hours ? 



c. Repeat (a), adding 2 per cent pepsin to the water. 



d. Repeat, using 2 per cent pepsin and 5 per cent acid. 



e. Put the four tubes (a), (b), (c), and (d) in water main- 

 tained at a temperature of 98 F. ; and note the result in two 

 or three hours. 



193. FOOD VEGETABLE FOOD 



The food of man falls naturally into two general divisions : 

 that which is obtained from plants, and that from animals. 

 Since man is an animal, it is doubtful if his body can work to 

 the best advantage without some animal food, either meat, 

 or milk and its products, as well as eggs. Vegetable food is 

 lacking in some of the constituents which form part of the 

 animal body, and those constituents must be supplied. 



Vegetable food contains a large amount of water, which is 

 beneficial, while fruits have a very salutary dietetic effect, 

 far exceeding their food value. People, as a rule, do not eat 

 enough vegetables and fruits. 

 References : 



1. 1407 : 514-523. Food Products for Human Use. 



2. 1501:120-129. Vegetable Food. 



3. 1702 : 397-398. Composition of Vegetable Foods. 



4. 1710 : 212-222. The Composition and Food Value of Fruits. 



5. 1901 : 86-99. Bread Raising ; Fermented Liquors. 



6. Farmers' Bulletin No. 93. Sugar as Food. 



7. Farmers' Bulletin No. 105 : 19-22. Cereal Breakfast Foods. 



8. Farmers' Bulletin No. 389. Bread and Bread Making. 



9. Farmers' Bulletin No. 121. Peas, Beans, and Other Legumes 



as Food. 



