XIII ATTENUATION OF VIRUS OF FOWL ENTERITIS 117 



this too became ill with the fowl enteritis and died. 

 But the nine fowls of lot B remained well many days 

 after the disease had come to an end in lot A. So 

 that though a wire netting separation with only 18 

 inches interval divided the fowls of lot A from those 

 of lot B, the disease from lot A was not communicated 

 to the latter fowls ; but on the other hand, the two 

 accessory fowls that had lived with the diseased fowls 

 of lot A in the same enclosure became infected. 



The nine control fowls of lot B were afterwards 

 inoculated with broth cultures, they all became ill on 

 the fifth day, and suffered from diarrhoea ; eight died, 

 one survived. 



From what has been stated in the preceding two 

 chapters, it is firmly established, I think, that both in 

 the nature and course of the disease, and in the 

 character and distribution of the bacilli, and in 

 the susceptibility of some and non-susceptibility of 

 certain other animals, fowl enteritis and fowl cholera 

 are two well - differentiated diseases. As has been 

 shown, particularly in the last chapter, the uniformity 

 in the symptoms and the duration of the incubation 

 period of the disease observed on a very large number 

 of fowls — nearly five dozen fowls were experimented 

 upon in the last five series of experiments — prove 

 conclusively the difference between the two diseases. 

 But I have some further experiments to record that 



