206 31anual of Veterinary 3Iicrobiology . 



pect of a bottle brush. This characteristic form is 

 only obtained with gelatin of firm consistence. The 

 bacillus of rouget appreciably lengthens in its cul- 

 tures. 



Research and coloration. — The specific germ can 

 Fig. 8. ^^ demonstrated in the blood, in the 



, . fluid exudates, and in sections of the 



^ T- various tissues afl:ected; on account 



** ^^ of its small size it is advisable to ex- 



Bacilli: 1, of amine only stained preparations and 

 pneumo-enter i t i s to employ a magnification of 800 di- 

 ""It-rM'fndM"' ^"^^^^^'«' ^* ^east. The bacillus of rou- 

 ^^ ■ ■ ^" get is stained by the hydro-alcoholic 



solutions of all the aniline colors ; the color is not re- 

 moved by the reactions of Gram and Weigert. 



ExiJerimental inoculations. — The bacilli of rouget are 

 fatal for the pig, rabbit, mouse and pigeon. The three 

 last species are especially sensitive and succumb to 

 subcutaneous, intra-peritoneal, or intra-venous inocu- 

 lations of a virulent product, whether natural or de- 

 . rived from culture. 



Subcutaneous inoculation may fail in the pig ; in- 

 gestion, although generally communicating the disease, 

 is also uncertain in its results. The mouse and the 

 pigeon succumb in two to four days; the pigeon takes 

 the form of a ball of feathers, as in cholera; the rab- 

 bit dies in three to six days. The lesions noticed at 

 the autopsy consist of a hypertrophy of the spleen 

 with congestion of the liver and lymphatic glands. 



The guinea pig, rat, dog, and chicken are refractory 

 to experimental inoculation. 



Etiology and pathogeny. — Although some tests of in- 

 fection by the digestive passage performed in Germany 



