210 CLASSIFICATION OF THE MICRO-ORGANISMS. 



bacillar septicaemia, were inoculated, that the course of 

 the disease could -be observed undisturbed by the pre- 

 sence of other bacteria. 



Micrococcus of Progressive Abscess Formation in 

 Rabbits. Minute cells, only about 0'15 p. in diameter, 

 generally in thick cloud-like zooglsea masses (fig. 53). 

 It was obtained by injection of putrefying blood into 



Fig. 53. Micrococcus of progressive abscess formation in rabbits 

 (after Koch) X 700. 



Border of a cheesy abscess : 



er, cloud-like masses of zooglsea. 



b, smaller colonies of micrococci. 



c, nuclei. 



rabbits ; an extensive abscess formed at the seat of 

 injection, and caused the death of the animals in about 

 12 days. No bacteria are present in the blood ; a finely 

 granular mass is found in the cheesy contents of the 

 abscess; the wall of the abscess is formed of a thin 

 layer of micrococci united in dense zooglsea masses ; 

 towards the interior of the abscess the zooglaea appears 

 to degenerate and die. Nevertheless the contents of 

 the abscess are infective, and set up the same disease 

 in healthy rabbits. 



Micrococcus of Pycemia in Rabbits. Round cells, 

 0'25 p. in diameter, for the most part single or united 

 in pairs ; they tend to surround and enclose the blood 

 corpuscles in a characteristic manner (fig. 54). The 

 disease in question was obtained by injection of fluid 

 used for maceration ; on post-mortem examination there 

 was great infiltration around the seat of injection, peri- 



