PATHOGENIC BACTERIA 105 



Sarcina Aurantica. Flava, rosea, and alba are some of the 

 other varieties. Many are obtained from beer. 



Sarcina Ventriculi (Goodsir) (Fig. 52). Origin. Stomach 

 of man and animals. 



Form. Colorless, oval cocci, in groups of eight and packets 

 of eight. 



Properties. Does not liquefy gelatin; shows the reaction of 

 cellulose to iodin. 



Growth. Rapid. At end of thirty-six hours, round, yellow 

 colonies, from which colorless cocci and cubes are obtained. 



Habitat. They are found in many diseases of the stomach, 

 especially when dilatation exists. Also normally; increased 

 when fermentation occurs. 



CHAPTER XVIII 

 PATHOGENIC BACTERIA 



WE have divided this part into two portions: 



I. Bacteria which are pathogenic for man and other animals. 



II. Bacteria which do not affect man, but are pathogenic 

 for the lower animals. 



Here again it will be possible to give only the more impor- 

 tant bacteria ; there are many diseases in which microorganisms 

 have been found, but they have not yet been proved as causa- 

 tive of the disease, and have also been found in other diseases. 

 We cannot treat of them here. 



Bacillus Anthracis (Rayer and Davaine). Rayer and 

 Davaine, in 1850, first described this bacillus; but Pasteur, and 

 later Koch, gave it the importance it now has. 



Synonyms. Bactericie du charbon (Fr.), Milzbrand bacillus 

 (German) ; bacillus of splenic fever or malignant pustule. 



Origin. In blood of anthrax-suffering animals. 



