l6o MICRO-ORGANISMS AND DISEASE: [chap. 



the same micrococci. Inoculated into the skin of fresh 

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

 coccus may therefore be called the micrococcus pycemicB of 

 mice, (V) 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 

 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 ™™- ™ 

 diameter. {c) Micrococcus causing pycBjnia 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 

 the subcutaneous tissue ; peritonitis ; spleen much enlarged ; 

 slight pneumonia. A hypodermic syringeful of the blood 

 of this animal was injected under the skin of a' second 

 rabbit, and this died after forty hours. Post-mortem exa- 

 mination showed the same lesions as in the first case. In 

 the blood-vessels of the affected parts were present micro- 

 cocci, single, as dumb-bells, and in zoogloea ; they were 

 spherical, about o'ooo25 mm. in diameter, {d) Micrococcus 

 causing septiccemia in rabbits. An infusion of meat was 

 prepared ; this was left to putrefy, and of this fluid a quantity 

 was injected under the skin of the back in two cases. Ex- 

 tensive gangrene with much osdematous exudation followed, 

 and death ensued in two days and a half The blood, the 

 capillaries of the kidney, and the enlarged spleen contained 

 numerous oval micrococci. Two drops of the oedematous 

 exudation-fluid were injected under the skin of the back 01 

 another rabbit. Death followed in twenty-two hours. There 



