INFECTIorS TRACHITIS 



35 



'1'abi.k 5. — Rksi'i.ts of inoci'i.at.on with Bekkefeld N fu.tuatk of 

 Cj1!AN!;v virus. 



Berkefeld N Filtrate of Granliy virus u.seil. 

 Unfiltered Granby virus from MC 60840 used. 



The Berkefeld V Filtrate 



The tliird part of tlie Graiihv virus whicii had been filtered througli 

 Berkefeld \' candles was used to inoculate three Rhode Island Red fowl-; 

 iniratracheally. Tlie results are recorded in Table (i. 



The virus of infectious trachitis i)assed the Berkefeld V filters in suffi- 

 cient quantities to inoculate I 1 IfiS and 3()9<)9. However, the filtrate had 

 no effect ui>on T 151.5, which was also found inunune to the MC 608+0 

 virus. 



