WHAT MAKES MAN GO 



59 



there is a wider range of variation among them. 



The term food has been given a restricted use 

 in the preceding paragraphs. In its broader 

 usage, oxygen, water, salts, vitamines, etc., are 

 foods if they furnish energy to protoplasm. None 

 of these can be included under a classification of 

 foods proper although they supply an indispen- 

 sable need. 



Most of the foods of man exist as mixtures of 

 all of the three classes as the following table indi- 

 cates : 



Table i. — Comparative Composition of Some Common Fruits.* 



Fruit 



Bananas 



Grapes 



Plums 



Cherries .... 

 Pears ....... 



Apples 



Oranges .... 

 Peaches .... 



Lemons 



Muskmelons 

 Strawberries 

 Watermelons 



Potatoes 



Sweet potatoes. 



to 



o . 



SI 



^^ -4-1 



lOI 



104 

 n8 

 128 

 158 

 159 

 195 

 213 

 226 

 252 

 269 

 332 



120 

 81 



* Taken from data compiled by Sherman, H. C: Chemistry 

 of Food Nutrition, New York, 1912, p. 319; from Bull. 28, Office 

 of Exper. Station, U. S. Dept. Agriculture. 



