32 THEORIES OF IMMUNITY 



in each pathologic state. It will be necessary to analyze 

 in detail a certain number of pathologic states caused by 

 different antigens in order to study their differences and 

 their common characteristics. We will begin this study by 

 the analysis of the action on the organism of the arseno- 

 benzenes because we know the chemical composition of these 

 substances. We will continue the studies by a series of 

 monographs having for their subjects the pathogenicity and 

 evolution of the better known infectious diseases : diphtheria, 

 tuberculosis, typhoid fever, with other intestinal infections 

 and septicemias caused by various parasites such as plague, 

 malaria and trypanosomiasis. 



