GANGRENE OF THE SPIvEEN IN SWINE. 



Hertzen records the case of a pig in which the spleen had be- 

 come gangrenous and lay free in a surrounding fibrous capsule. 



TUBERCLES AND GLANDERS NODULES OF THE 



SPLEEN. 



Tubercles in the spleen are common in cattle, swine, guinea- 

 pigs, rabbits and cats, in the last largelj' as the result of inges- 

 tion of tuberculous meat. In the larger mammals individual 

 tubercles are usually of the size of a walnut and upward, while 

 in the smaller they show as miliary deposits. The products are 

 often caseated or calcified. 



Glander nodules are found in the spleen of the horse and other 

 solipeds and as the result of inoculation in that of rabbits and 

 guinea-pigs. In .solipeds they may be of considerable .size 

 whereas in the inoculated rodents they are usually small and 

 numerous — like millet seed or pins' heads. 



PARASITES OF THE SPLEEN. 



Parasites are le,ss common in the .spleen than might be expected 

 yet the encysted parasites of the liver and pancreas, are al.so to be 

 found in the spleen. Thus echinococcus is found in the .spleen of 

 cattle, and headless hydatids in that of the horse ; cysticercus 

 tenuicollis in the spleen of sheep ; cysticercus cellulosa in that of 

 pigs ; distomata, and pentastoma denticulata in the spleen of 

 cattle; cocddia in the .spleen of rabbits; and actinomyces in 

 that of horses and cattle. 



In addition to these the spleen is a general rendezvous for the 

 different pathogenic organisms that can survive in the blood 

 stream, such as the bacilli of tubercle, glanders, septicaemia, 

 anthrax, black quarter, swine plague and hog cholera, and for 

 the cocci of suppuration, strangles, contagious pneumonia, etc. 

 (See Parasites and Contagious Diseases). 

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