MISCELLANEOUS SERA AND EXTRACTS 71 



treatment of various diseases, the mixed products of 

 several varieties of bacteria are employed, whether 

 these varieties of bacteria are found in the particular 

 infection or not. 



Without going into further detail, we are of the 

 opinion that the therapeutic use of phylacogens is 

 based upon erroneous conceptions of infection and im- 

 munity, is unscientific, empirical, and unjustified. 

 Moreover, there is evidence that their administration 

 is not unattended with risk to the patient. 



