460 BACTERIOLOGY. 



viduals, and in the outside world. Thus, Pawlowsky 

 found it in the atmosphere and Mori in canal water; 

 Netter observed it in 4.5 per cent, of the cases ex- 

 amined by him in the saliva of healthy individuals, 

 and Pansini in cases of pulmonary tuberculosis in 

 the sputum. Friedlander believed that the bacillus 

 described by him was the specific cause of croupous 

 pneumonia; but in 129 cases examined by Weichsel- 

 baum this bacillus was found in only 9; of 70 cases 

 examined by Wolf only 3 showed the presence of Fried- 

 lander's pneumobacillus. It is evident, therefore, that 

 though this micro-organism may be concerned in the 

 production of certain forms of the disease, it is not the 

 specific cause of croupous pneumonia. The cases which 

 are due primarily to the pneumobacillus are distin- 

 guished, according to Weichselbaum and Netter, by 

 their peculiarly malignant type and by the viscidity of 

 the exudate produced. This bacillus is also probably 

 concerned, primarily or secondarily, under certain cir- 

 cumstances, in the production of pleurisy, abscess of 

 the lungs, pericarditis, endocarditis, otitis media, and 

 meningitis, in all of which diseases it has been found 

 at times to be present. 



