EXPERIMENTAL RESEARCHES ON 

 SPECIFIC THERAPEUTICS. 



LECTURE I. 



ON IMMUNITY WITH ESPECIAL REFERENCE TO THE RELA- 

 TIONS EXISTING BETWEEN THE DISTRIBUTION AND 

 THE ACTION OF ANTIGENS. 



THERE can be no doubt that the three great 

 fields of knowledge, Pharmacology, Toxicology 

 and Therapeutics, in their theoretical and prac- 

 tical aspects form the most important branches 

 of medicine. It is matter, therefore, for no 

 surprise that in the study of the various sub- 

 stances with which these sciences are concerned, 

 the mode of action and the reasons for such 

 call for much consideration, and theory and 

 speculation necessarily form a great part of our 

 study. 



