50 PLANT DISEASE 



From this it follows that as the chlorophyll 

 and the carbohydrates vary, so will the haemo- 

 globin and the carbohydrates, including gly co- 

 gen, vary in the animal, and as a well fed animal 

 contains more glycogen than a starved one, 

 if follows that two fields, one containing all the 

 chlorophyll constituents, and the other very 

 deficient in the same, must produce two very 

 different kinds of herbage. Consequently the 

 sheep or other animals grazing on the pasture 

 produced by these two fields must be chemically 

 different in so much that the animals grazing 

 on the normal pasture will have the maximum 

 of glycogen in their livers with the minimum 

 of food, while those grazing on the chlorotic 

 food will have the maximum of food with the 

 minimum of glycogen, with its surrounding 

 disadvantages, which will include biliousness 

 and other liver diseases. 



It is clear from the foregoing that if a varia- 

 tion in the food can produce a variation in the 

 quantity of the glycogen, that a variation in 

 the quantity or quality of the food for any 

 length of time must produce a deficiency of 

 other carbohydrates in the animal, and if the 

 carbohydrates can be effected by the food then 



