298 PATHOGENIC BACTERIA. 



described as lanceolate. However, popular parlance has 

 now made it almost impossible to introduce Bacillus pneu- 

 monice instead of Diplococcus pneumonia (Weichselbaum), 

 especially as there is already another organism bearing 

 that name. (See Bacillus pneumonia of Friedlander. ) 

 The organism (Fig. 95) is variable in its morphology. 

 When grown in bouillon it is oval, has a pronounced dis- 



FIG. 95. Diplococcus pneumoniae, from the heart's blood of a rabbit; x iooo> 

 (Frankel and Pfeiffer). 



position to occur in pairs, and not infrequently forms 

 chains of five or six members, so that some have been 

 disposed to look upon it as a streptococcus (Gamaleia). 

 In the fibrinous exudate from croupous pneumonia, in 

 the rusty sputum, and in the blood of rabbits and mice 

 containing them the organisms are arranged in pairs, 

 exhibit a distinct lanceolate shape, the pointed ends 

 generally approximated, and are usually surrounded by 

 a distinct halo or capsule of clear, colorless, homogeneous 

 material, thought by some to be a swollen cell-wall, by 



