508 



Pneumonia 



most cases, unimportant, though it is sometimes asso- 

 ciated with and is probably the cause of a special form 

 of lobular pneumonia, which, according to Stiihlern,* is 

 clinically atypical and usually fatal. Frankel points out that 

 Friedlander's error in supposing his organism to be the chief 

 parasite in pneumonia depended upon the fact that his studies 

 were made by the plate method, which permitted the dis- 

 covery of this bacillus to be made more easily than that of 

 the slowly growing and more delicate pneumococcus. In 

 the light of present knowledge Friedlander's bacillus must be 



Fig. 164. Bacterium pneumonicum (modified after Migula). 



looked upon as the type of a group of organisms varying among 

 themselves in many minor particulars. 



Distribution. The organism is sometimes found in 

 normal saliva; it is a common parasite of the respiratory 

 apparatus, not infrequently occurs in purulent accumula- 

 tions, is occasionally found in feces, and sometimes occurs 

 under external saprophytic conditions. Thus it is probably 

 identical with that described as the " capsulated canal-water 

 bacillus " by Mori,f and may be identical with or at least 

 belong to the same group in which we find Bacillus aerogenes 

 capsulatus. 



*"Centralbl. f. Bakt.," etc. (Originale), Bd. xxxvi, No. 4, p. 493, 

 July 21, 1904. 



t "Zeitschnft fur Hygiene," iv, 1888, p. 53. 



