236 BACTERIOLOGY. 



therefore should make an end once for all of 

 the loose terminology which has been in vogue 

 in medicine. When I presented this view at 

 the Naturalists' Meeting in 1893, the objection 

 was made from various sources that, in view 

 of the incomplete theoretical knowledge and 

 scientific training possessed by many phy- 

 sicians, my exposition was somewhat too recon- 

 dite. I have tried now in this way to make it 

 sufficiently clear that in the exact sciences 

 there is absolutely no place for the toys of 

 ontology, for entities or for essences, but that 

 we must deal with dynamic phenomena, with 

 processes which interlock with one another. 

 That, I trust, is the plain sense of my detailed 

 exposition. 



I now hope also to show in a . way intelli- 

 gible to my readers that even in the organic 

 kingdom and especially as regards the doc- 

 trine of the origination of infectious disease 

 we have no place for the " entities " of Syden- 

 hq,m's " specific disease," or of Virchow's dis- 

 eased cells, or of Pettenkofer's determining cir- 

 cumstances of time and place, or of Pasteur's, 

 Kleb's, F. Cohn's, and Koch's " specific " 

 disease- producing bacteria. I hope further to 

 show that, in considering the origination of 

 infectious disease and the dynamic processes 

 which are concerned, we can take account of 



