VII.] 



MICROCOCCUS. 



where they extended amongst the inflammatory products in 

 great masses. The abscesses in the lungs were filled with 

 the same micrococci. Inoculated into the skin of fresh 

 mice, it again produced death by pyaemia. This micro- 

 coccus may therefore be called the micrococcus pyamia of 

 mice, (b) Micrococcus causing abscesses in rabbits. Putrid 

 blood injected into the subcutaneous tissue of the rabbit 

 often produces suppurative abscess which, spreading, kills 

 the animal in about twelve days. In the wall of the abscess 



FIG. 28. FROM A SECTION THROUGH THE TAIL OF A MOUSE INOCULATED INTO 

 THE SUBCUTANEOUS TISSUE OF THE TAIL WITH ARTIFICIALLY CULTIVATKD 

 MICROCOCCUS. 



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



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



2. Fat cells. 



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



are found continuous masses of zoogloea of micrococci. 

 The pus is infectious. The micrococci are spherical, and of 

 a very minute size, measuring only about 0*00015 mm. in 

 diameter. (c} Micrococcus causing pyamia in rabbits. 

 Skin of a mouse was macerated in distilled water for two 

 days, and of this fluid a hypodermic syringeful was injected 

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

 animal began to lose flesh and died after 105 hours. 

 Purulent infiltration spread from the seat of inoculation into 



G 2 



