288 MICROBIOLOGY 



Milk. In twenty-four hours a luxuriant growth appears, 

 but the milk itself is not changed. After two days, the milk 

 begins to coagulate, and from the depth of the culture tube to 

 the surface, the whey freely separates. 



Life conditions and properties. In favorable media these 

 bacteria were found to live 10 weeks at room temperature. 

 Growth continued at 55 C. but ceased at 59 C. The bacteria 

 have slight powers of resistance against drying. They are 

 quickly destroyed by formaldehyde gas and sulphurous acid. 

 The best temperature for growth is 37 C. Slightly alkaline 

 culture media are most favorable for their multiplication. 



Pathogenesis. When rabbits are inoculated subcutan- 

 eously, abscesses form about the point of inoculation. It fre- 

 quently happens that the pathogenic effect is slight ; many of 

 the animals which sicken after a single inoculation subse- 

 quently recover. Grips found that the culture with which he 

 worked, when inoculated in comparatively large quantities, 

 would kill rabbits and mice. 



BACTERIA OF PYELONEPHRITIS IN CATTLE. 



A number of investigations have been made to determine 

 the etiology of abscess formation in the kidneys of cattle. A 

 large number of bacteria have been found but those which 

 seemed to be best described resemble very closely Bact. pyo- 

 gencs. It is probable, however, that a number of varieties and 

 possibly several species of bacteria stand in a causal relation 

 to pyelonephritis in cattle. Ritzenthaler 6 has summarized 

 the literature on these lesions especially in relation to their 

 etiology. Some of these investigators found a single organism 

 while others found several species associated with the lesion. 



BACTERIUM SANGUINARIUM MOORE. 



Synonyms. Bacterium of fowl typhoid. 



6 Ritzenthaler. Jour, of Comp. Path, and Therap., Vol. XXIII 

 (1910) p. 33. 



