BY DR. OSCAR KATZ. 547 



1 gramme of the fascal matter, kept moist since the preceding day 

 under a bell-jar. The rabbit, when seen at 10 p.m., had eaten all 

 the food. It, however, did not show anything abnormal afterwards. 

 It remained intact from this treatment. 



(2) Contents of csecum from a young rabbit, dead from " chicken-cholera " 

 (feeding on virulent material). The caecum was laid open at one 

 spot by means of a hot scalpel, and the matter cautiously collected in 

 a sterile test-tube. 



October 15th, about 11 a.m. 



Two half-grown rabbits which had not received any food in the 

 morning, were given, together in one hutch, cabbage-leaves to which 

 were attached 5ccm. of a mixture consisting half of the above 

 material and half of a 0"6 per cent, sterile salt-solution. They had 

 eaten all but a few small pieces of leaves at 12.30 p.m., and had 

 quite finished eating when seen at 2 p.m. 



Results : 



One was observed to be dying at 8.10 p.m., October 16th. As it 

 was paralysed and evidently in pain, it was then killed. 

 The other was found dead at 9.15 p.m., October 18th. 

 In both instances the post-mortem examination yielded a nega- 

 tive result with regard to " chicken-cholera." 



(3) Contents of cfecum from a robust full-grown rabbit shortly after its 

 death from " chicken-cholera " (feeding on virulent microbes). 

 Material derived as before. 



1889. 



(a) Inoculation. 



May 6th. — One full-grown healthy rabbit inoculated (as before) at 4.45 

 p.m. with a medium-sized platinum-loop full of such material from 

 caecum. It died at 7.25 p.m.. May 7th, under characteristic 

 symptoms. The subsequent post-mortem examination secured the 

 diagnosis — " chicken-cholera." 



(b) Feeding. 



May 6th. — One full-grown healthy rabbit was given, shortly after the 

 above time, some bran with which were mixed 2 grammes of the 

 matter of the caecum-contents, diluted with some 0"6 per cent, sterile 

 salt-solution. 



The rabbit, being still lively on May 20th, was taken from its 

 hutch and turned loose in an enclosure with others. According to 



