I 



88 CONTAGIOUS DISEASES OF DOMESTICATED ANIMALS. 



of micrococci were foiiud iu the deeper parts of the tissue. No rods 

 could be fouud even iu sections staiued with fuchsiue, a staiu which 

 Klein used in his investigations. 



In sections of the spleen, stained in various ways, no organism could 

 be detected. 



Sections of the most congested mesenteric gland revealed no organ- 

 isms within the gland tissue, but the peritoneal surface and its serous 

 covering were studded with micrococci, interspersed with which might 

 be seen a considerable number of large and small rods. 



Pig No. 39 was inoculated July 17, and was slaughtered August 11, 

 being at that time very severely affected, and presenting well-marked 

 symptoms of swine i^lague. The mesenteric vessels were congested, as 

 were those about the ileo-ciecal valve, but there were no ulcerations at 

 this point. The lungs were pale, but contained a number of dark-col- 

 ored congested patches. There was no pleural effusion ; the pericardial 

 cavity contained a considerable amount of liquid, and there was also 

 slight peritoneal effusion. m 



Cultures of the pericardial fluid gave a pure growth of micrococci. 

 The vacuum tubes, filled with peritoneal fluid, were preserved until 

 September 2, and were then f^uud to contain large numbers of micro- 

 cocci, but no other organisms. 



A large number of observations similar to the above have been made, 

 and in all cases where a pure cultivation has been obtained the organ- 

 ism which multiplied was a micrococcus, and when the virulence of 

 such cultivated micrococci has been tested by iuoculation experiments 

 typical and fatal cases of swine plague have resulted. 

 Eespectfully submitted, 



D. E. SALMON, D. V. M. 



