PATHOGENIC BACTERIA 



131 



Pneumo-bacillus (Pneumocoecus). (Friedlander.) 

 Origin. In the lung of a croupous-pneumonia person, by 

 Friedlander, in 1882. 



FIG. 68. 



Bacillus pneumonias of Friedlander, from the expectoration of a pneumonia patient ; 

 X 1000 (Frankel and Pfeitterj. 



Form. Small, almost oval-shaped rods, nearly as wide as 

 they are long ; often in pairs, they were at first believed to be 

 cocci. In bouillon cultures the rod-form becomes more visible. 

 In tissues each bacillus is surrounded by a faint capsule ; but 

 not around those developed in artificial cultures. Spores have 

 not been found. 



Properties. They are immobile ; do not liquefy gelatine. A 

 gas is produced in gelatine cultures. 



Growth. Grows rapidly on all media at ordinary temperature ; 

 is facultative aerobic. 



Colonies. On gelatine plates. Small white round colonies, 

 reaching the surface in the course of three or four days ; appear- 

 ing then as little buttons, with a porcelain-like shimmer, the 

 edges smooth. 



