BY DR. OSCAR KATZ. 541 



Disease-Division. 



The Jifteen rabbits (all full-grown, well-conditioned specimens) which 

 after being fed on 2ccni. of virulent broth-culture for each, on cabbage- 

 leaves, were let go in the disease-division— ^ve on February 12th, Jive 

 on February 19th, Jive on February 26th, — died promptly without 

 exception ; the majority of them must have died in less than 20 hours. 

 Nine of the Jifteen died outside, Jive inside the burrows, * and one half 

 outside and half inside. Among the nine first mentioned is included 

 one, which lay dead in a hollow covered over by a stone, and which 

 was easily accessible. 



With one exception, the carcasses of the rabbits remained on the 

 spot where they were found lying, until the end of the experiment, 

 without any microscopical examination of their blood being made. 

 The exception referred to is a rabbit which, forming one of the last 

 batch of five rabbits placed in the division, February 26th, was found 

 dead the following day^ outside burrows. It was, on examination, 

 found to be much bruised on the left side of chest and belly, an occur- 

 rence which must have accelerated its death, as putrefaction of the 

 organs had already set in when the examination took place, soon after 

 the rabbit was found dead. However, the heart-blood clearly showed 

 the presence of numerous bacteria of " chicken-cholera. " An unusually 

 vigorous buck, inoculated with a small quantity of such blood, suc- 

 cumbed to " chicken-cholera" somewhat less than twelve hours after- 

 wards. On the following morning, the intact carcass of one of the 

 control-rabbits (see below) which had died the previous evening, was 

 put in the place of the one removed from the enclosure. 



The Jifteen rahhits lying scattered in the disease-division undoubtedly 

 perished from "chicken-cholera." On the one hand, /owr^eew control- 

 rabbits, which speedily died without a single exception, died from 

 " chicken-cholera," as unmistakably shown by the results of careful 

 examinations. On the other hand, the appearance of the carcasses, and 

 the symptoms which some of the rabbits were observed to exhibit 

 when dying, corresponded with what occurs in " chicken- cholera " 

 rabbits. 



Of the Jifty uninfected {i.e., intact) rabbits, let loose in the disease- 

 division at the beginning of the experiment, four died from " chicken- 



The burrows were, of course, opened from time to time ; in all nine times. 



