MORBID ANATOMY 



287 



the place of inoculation and later crackling on account of the 

 formation of gas. 



Of the domestic animals, the horse is the most susceptible 



Fig. 64. Bacillus oedematis maligni ivith flagella and spores {Hutyra ) . 



to natural infection ; the cow, the sheep and the goat are less 

 susceptible. The pig, dog and cat are rarely attacked. 



Infection sometimes follows contusions or lacerations, 

 sometimes delivery, when in the latter help is given with hands 

 or instruments not clean, while in other cases it occurs such as 

 smallpox vaccination, castration, shearing, bleeding, drawing 

 setons, subcutaneous injections where unclean syringes are 

 used. 



§ 210. Morbid Anatomy. On the expansion of a 

 tumor appearing in any part of the body, the connective tissue 

 is distended and infiltrated with yellow or reddish fluid con- 

 taining many small gas bubbles, which emits a characteristic 

 odor. These gelatinous infiltrations of the connective tissue 

 follow between the deeper layers of the muscle. The muscle 

 itself is often sallow or dark red in color and is very brittle. 

 The connective tissue in places seems to be strewn with larger 

 or smaller hemorrhages. In the intestinal cavity there is a 

 little reddish, serous fluid ; the peritoneum is deeply injected. 

 In the cases in which malignant edema has developed in con- 

 nection with parturition the uterus is insufficiently contracted, 

 the subserous connective tissue of the true pelvis and the walls 

 of the uterus are edematously infiltrated. 



