300 THE ZOOLOGIST. 



occurred in the mucous membrane of the pyloric region of the 

 stomach, as well as at the anterior portion of the duodenum, and 

 the "Peyer's bodies" were frequently congested, and also some- 

 what swollen. The lower part of the small intestine was 

 generally filled with blackish contents. The mesenteric glands 

 were distinctly, and sometimes considerably, swollen, dark 

 reddish grey in colour, and permeated by haemorrhage. 



The kidneys were usually pale, sometimes parenchymatously 

 coloured. The lungs were sometimes normal, and sometimes 

 blotched with red. Here and there brownish red portions were 

 visible. The brain exhibited nothing peculiar. 



Bacteriological investigation gave precisely similar results in 

 all the mice examined. On expressed preparations (ausstrich- 

 prdparaten) of the liver and the spleen, I found short bacilli, 

 usually very numerous, but sometimes very sparingly, resembling 

 the bacilli of pigeon-diphtheria (Taubendiphtherie) . These varied 

 in length and breadth, both in the same individual and in different 

 cases. Many appeared truncated, especially when the bacilli were 

 present in large masses, and many were strongly developed. In 

 this respect the rods resembled those of the typhus-bacillus, 

 which also varies in size within certain limits. When examined 

 in hollow object-holders, they exhibited lively movements similar 

 to those of the typhus-bacillus. This led to the suspicion that 

 these, like the latter, might have multiple flagella. In fact, they 

 behaved like the typhus-bacillus when macerated in a suitable 

 infusion, but better still when macerated in rather strong alkali, 

 which made the lateral flagella visible. In some mice bacilli 

 could be detected in all the organs, while in others they were 

 sought for (in blood from the cardiac region, for example) without 

 success. But similar bacilli were obtained by culture from all 

 the mice. Tubes of gelatine cultures were prepared from the 

 liver, from the spleen, and from the cardiac region. The 

 culture from the last named remained sterile in many cases, 

 but colonies were invariably developed from the spleen, and 

 especially from the liver. The number of these differed very 

 considerably. Sometimes the whole surface of the gelatine was 

 covered with an even coating of bacilli ; sometimes the separate 

 colonies were separated and developed at a considerable distance 

 from each other, and sometimes only a few colonies appeared on 

 the entire surface of the gelatine. On the whole, the number of 





