vii ] MICROCOCCUS. 57 



inflammation and abscess in the lungs set in and the animals 

 died after about a week. On making longitudinal sections 

 through the tail, it was found that in most of the lymph- 

 spaces and lymph-vessels of all parts of the cutis and subcu- 

 taneous tissue, far away from the seat of inflammation, there 

 were dense crowded masses of the same minute micrococci as 

 were used for inoculation And these crowds of micrococci 

 could be traced to the seat of inflammation, where they ex- 

 tended amongst the inflammatory products in great masses. 

 The abscesses in the lungs were filled with the same micro- 

 cocci Inoculated into the skin of fresh mice, it again pro- 

 duced death by pyaBmia. This micrococcus may therefore 

 be called the micrococcus pycemice of mice. (6) Microccccus 

 causing abscesses in rabbits. Putrid blood injected into the 



FIG. 25. FEOM A SECTION THROUGH THE TAIL OF A MOUSE INOCULATED 

 INTO THE SSCBCCTAXEOUS TISSUE OF THE TAIL WITH ARTIFICIALLY CULTI- 

 VATED MICROCOCCUS. 



The part here illustrated is a good distance from the ulceration. 



1. A capillary blood-vessel filled with blood-corpuscles. 



2. Fat cells. 



3. Groups of micrococci filling the lymph-spaces of the connective tissue. 



subcutaneous tissue of the rabbit often produces suppurative 

 abscess which, spreading, kills the animal in about twelve days. 

 In the wall of the abscess are found continuous masses of 

 zooglcea of micrococci The pus is infectious. The micrococci 

 are spherical, and of a very minute size, measuring only about 

 O'OOOlo mm. in diameter, (c) Micrococcus causing pyaemia in 

 rabbits. Skin of a mouse was macerated in distilled water for 

 two days, and of this fluid a hypodermic syringe-full was in- 

 jected under the skin of the back of a rabbit. After two days 

 the animal began to lose flesh and died after 105 hours. 



