240 MANUAL OF BACTERIOLOGY. 



cocci and streptococci were found by Ritchie* to be the com- 

 monest causes. 



In inflammations of the middle ear the principal causes are 

 the pneumococcus, the streptococcus and the Staphylococcus 

 aureus and albus.f 



In 25 cases of acute cystitis in woman Brownf found B. coli 

 communis, 15 times; S. pyogenes albus, 5 times; S. pyogenes 

 aureus, twice; B. typhosus, once; B. pyocyaneus, once; B. pro- 

 teus vulgaris, once. 



* 





Fig. 59. — Staphylococcus Pyogenes Aukeus in Pus Stained by Gram's 

 Method. (X 1000.) 



A number of investigators have recovered organisms re- 

 sembling the pyogenic cocci from cases of acute articular 

 rheumatism. Most frequently a diplococcus or short strepto- 

 coccus has been found, which has sometimes produced ar- 

 thritis and endocarditis when inoculated into rabbits. But 



* Ritchie. Journal Pathology and Bacteriology. Vol. VII. December, igoo. 

 t Hasslauer. Cenlralblatt jiir Bakleriologie. XXXII. Ref. 1902, p. 174. 

 Compare ibid., pp. 240 and 246. 



% Johns Hopkins Hospital Reports. Vol. X. 1902. 



