3d 



MASS. EXPERIMENT STATION BU[,leTIN 273 



Tahi.k k — Results of inoculation with Beukefeld W iiltrate op 



GuANBY VIRUS. 



Berkefeld W filtrate of Granby virus used. 

 Unfiltered Granby virus from MC 60840 used. 



The Berkefeld N Filtrate 



Tliree Rliode Island Red fowls were treated iiitratracheally on Novein- 

 her 28, 1.929, with the Berkefeld N filtrate and the clinical s.vmptoms and 

 l)atholoj>ical lesions noted are shown in Table 5. 



The results of this experiment on the filtration of infectious trachitis 

 virus through Berkefeld N filters indicate that the virus is filtrable in small 

 Quantities, since one out of three susceptible fowls was successfully in- 

 oculated with it. 



