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. Friedlinder believed that the bacillus 
described by him was the specific cause of croupous 
pneumonia; bnt 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- 
linder’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. 
