WILLIAM T. COUNCILMAN 1 1 I 



of philosophy ; but science cannot be studied in this way. 

 There is no short, no easy way. 



There are certain diseases in the study of which it has 

 not been possible to utilize animal experimentation, and 

 in these diseases there has been no advance of knowledge, 

 and our power to relieve is correspondingly deficient. 

 This is true in certain changes in the blood, as leucemia 

 and anemia, and in certain of the malignant tumors, and 

 in such infectious diseases as syphilis and leprosy. In 

 the case of the malignant tumors, however, there is a fair 

 prospect, since we have begun to apply experimental 

 methods to their study, that our knowledge, and with that 

 our power to relieve, may be increased. 



