EXPERIMENTS WITH VIRUS OF CATTLE PLAGUE. 321 



CONCLUSIONS. 



The following conclusions seem justified from the experiments" pre- 

 viously reported and those here recorded: 



1. Blood, laked or unlaked, and bile of animals sick with cattle plague, 

 lose their virulence on being passed through Berkefeld filters marked 

 V, N, or W. 



2. Peritoneal fluid retains its virulence on being passed through 

 Berkefeld filters marked V, N, or W, but is harmless after having been 

 passed through a Chamberland filter marked B. 



3. Conclusions relative to the Chamberland filter marked F will be 

 reserved for the present. It is intended to test a larger number of these 

 filters when opportunity permits, and the results therefrom will be 

 reported later. 



I wish to express my gratitude to Dr. Nesom, Director of the Bureau of 

 Agriculture, and to Dr. Sliealy, of the same Bureau, for the peritoneal 

 fluid and for the bullocks used in this work. 



