AND ITS RELATION TO ANIMAL LIFE 15 



In Epidemics, Plagues and Fevers: their 

 Cause and Prevention, page 395, the Hon. 

 Rollo Russell says : " Dr. Buchner ascribes 

 immunity to proteid substances. Wild rats 

 fed on plain bread for about six weeks, suc- 

 cumbed to anthrax with which they were 

 inoculated, others fed on flesh did not take it, 

 and their spleens were found to contain an 

 abundance of the proteids." 



Proteids, as stated above, are carbon com- 

 pounds which must be taken in by the animal 

 through the medium of food (General Physiology, 

 by Max Verworn, p. 158). 



I have shown that the carbon of the plant is 

 governed by the chlorophyll, that the chloro- 

 phyll depends upon the iron, and that chlorotic 

 plants must contain less carbon compounds 

 than plants containing the maximum of iron 

 and consequently of chlorophyll, from which 

 it follows that a chlorotic plant will contain 

 less proteids than a plant containing the 

 maximum quantity of iron. 



I have also shown that a normal food con- 

 taining a normal chlorophyll is a food which 

 will enable the animal to take up the maximum 



