FOODS. 327 



not employ even such substances as eggs, cheese and milk, 

 but confine themselves to a purely vegetable diet (such as is 

 always poor in proteids), daily take far more carbon than they 

 require, and are to be congratulated on their excellent diges- 

 tions which are able to stand the strain. Those who use eggs, 

 cheese, etc., can of course get on very well, since such sub- 

 stances are extremely rich in proteids, and supply the nitro- 

 gen needed without the necessity of swallowing the vast bulk 

 of food which must be eaten in order to get it from plants 

 directly. 



