BY DR. OSCAR KATZ. 565 



Nearly five months and a-half later, the rooster, which was then 

 very robust, received subcutaneously (breast) a much larger quan- 

 tity of virulent rabbit-blood [see Table VII. (at the end) (e)]. 

 This time the rooster did not resist; it died, under the typical 

 chicken-cholera symptoms, 27 hours after inoculation, after a 

 short illness. The post-7norte7)i examination revealed an example 

 of severe chicken -cholera. The duodenum was filled with almost 

 one mass of blood. 



Two pigeons which were repeatedly fed (the one twice, the 

 other three times) on food contaminated with active microbes, 

 succumbed promptly to the effects of inoculation later on, thus 

 showing that they had not been rendered immune by the previous 

 treatments. However, in the judgment of these results, it should 

 be borne in mind that, as the pigeons were too slow in eating 

 (see Table VII.), the preceding treatments (feeding) cannot be 

 regarded as exact. (The results of the post-mortem examinations 

 are simply denoted as positive in the table.) 



(b). 



Experiment with a view to ascertaining the effect of exposing 

 poultry to rabbits which are dying from " chicken-cholera " 

 (after feeding), and the carcasses of which are allowed to 

 remain with the former for some time. 



For this purpose the Aviary on the Island, shortly described in 

 the Introduction, was utilised. At the beginning of the experi- 

 ment, November 9th, 1888, it contained nine fowls, (of which 

 three had been there for some time, as left over from a former 

 consignment of twelve, and six had been received from the Sydney 

 Markets the day before, November 8th), and twelve pigeons, also 

 obtained from the Markets on the latter date. Neither the fowls 

 nor the pigeons had so far been experimented upon in any way. 

 . The experiment, as already mentioned, was begun November 

 9th, and lasted five weeks, up to December 14th. 



Within this period rabbits were introduced, at intervals, in all 

 three times. 



