THE COMPONENTS OF PLANTS AND ANIMALS 21 



TABLE 2. COMPOSITION OF ANIMAL FATS 



Benedict and Osterberg 1 obtained the following for the com- 

 position of human fat : 



TABLE 3. COMPOSITION OF HUMAN FAT 



The average carbon content of animal fat is commonly con- 

 sidered to be 76.5 per cent. 



Waxes 



35. In popular usage, the distinction between fats and waxes is 

 based upon their obvious physical properties, substances having the 

 well-known greasy feel being called fats or oils according to their 

 consistency at ordinary temperatures while the waxes are solid, can 

 be kneaded and lack largely or wholly the greasy feel. 



1 Amer. Jour. Physiol., 4 (1901), 69. 



