I04 THE GROUSE DISEASE chap. 



of the same fowls with gelatine sub-culture, eleven 

 days old, proved without success, although the same 

 gelatine sub-culture when inoculated subcutaneously 

 (Sub -experiment 5) proved virulent. We conclude, 

 therefore, that although some bacilli — e.g. of the in- 

 testinal mucus — when introduced by ingestion, escape 

 the action of the stomach and prove capable of infec- 

 tion (Experiment 5), this is the case only to a limited 

 degree. 



Experiments on other Animals 



7. Pigeons, notoriously susceptible to fowl cholera, 

 are quite refractory to fowl enteritis ; in no single 

 instance have I been able to produce illness after 

 inoculation with large doses of virulent material ; that 

 is, material which proved virulent for fowls, even in 

 small doses. 



8. As is well known, rabbits are extremely sus- 

 ceptible to fowl cholera; but to fowl enteritis their 

 behaviour is altogether different. A drop of blood of 

 a fowl dead of fowl cholera, or a drop of a recent 

 broth sub-culture of the bacillus of fowl cholera, injected 

 subcutaneously into a rabbit, produces infection and 

 death in from 20 to 30 hours without fail. Rabbits were 

 injected subcutaneously with 5-10 minims of blood 

 and spleen tissue of the Orpington fowls, as also of 



