36 PLANT DISEASE 



deadly poison. If such a slight change can 

 make the difference between a food and a 

 poison in animal life, it is reasonable to think 

 that a slight change in the carbon compounds 

 of the animal can make the difference between 

 a food and a poison for fungi ; and there is 

 no question that such a variation may well 

 exist between animals in a normal and those 

 in an abnormal or anaemic condition. 



I have tried to make it clear that it is abso- 

 lutely imperative for the health and develop- 

 ment of the human race that chlorotic plant 

 life must be removed from the surface of the 

 civilized globe, for every one knows there are 

 an innumerable number of carbon compounds 

 in both plant and animal life ; and as it is 

 clear that the carbon of plant life is governed 

 by the iron, to say nothing of the other 

 mineral constituents, so must the carbon 

 compounds be governed in the same way, and 

 as the whole series of carbon compounds of 

 the herbivora are governed by the carbon 

 compounds of the vegetable foods they eat, so 

 must they vary as the state of the chlorophyll. 

 And as man lives by the products of vegetable 

 and animal life, so must the various chemical 



