AND ITS RELATION TO ANIMAL LIFE 49 



pp. 750, 751, the author points out that " Gly- 

 cogen is a carbohydrate compound found in 

 the liver, and that this glycogen is plentiful 

 in the liver of a well-fed animal, and that by 

 starving an animal the glycogen can be reduced 

 to a mere trace, which can be again increased 

 by feeding an animal on foods rich in carbohy- 

 drates." 



I have previously pointed out that the 

 carbohydrates of the plant are governed by 

 the chlorophyll of the plant, and must conse- 

 quently vary with the chlorophyll. 



Owing to the close connexion between the 

 chlorophyll and the haemoglobin, this varia- 

 tion must also be reproduced in the haemo- 

 globin and the carbohydrates of the animal, 

 glycogen being, as we have seen, dependent 

 upon the quantity and quality of the food 

 consumed, it follows that an animal grazing 

 on good land will have a sufficiency of glycogen 

 while one grazing on poor land will be deficient 

 in that constituent, and hence more liable to 

 disease of the liver. This should be so in 

 theory, and according to my own experience 

 is so in practice. 



