146 NON-PATHOGENIC BACTERIA. 



coccus. It possesses a single flagellum. It is a facultative 

 anaerobe, growing very readily on all ordinary media at the 

 room temperature. It produces a rose-red pigment. Gelatin 

 is slowly liquefied. The coccus stains with the anilin colors 

 and with Gram's stain. 



Micrococcus ureas : Usually this is found only in urine 

 which has undergone ammoniacal decomposition ; but occa- 

 sionally it can be cultivated from the air. It grows in vary- 

 ing forms, sometimes as a micrococcus, and at other times as 

 a diplococcus or streptococcus. It is strongly aerobic, grow- 

 ing best at a temperature near that of the body. Gelatin is 

 not liquefied. It decomposes urea, producing ammonium car- 

 bonate. It is stained easily by the anilin dyes, but not with 

 Gram's. A Bacterium urece also is described, with properties 

 similar to those of the micrococcus. It is probably only a 

 variation of the latter. The tube cultures of the coccus are 

 not characteristic. In plate culture waxy-looking colonies 

 are formed. 



Sarcina ventriculi : Several different species of sarcina have 

 been described, of which this is the most important. It 

 is found in the stomach of man and animals under normal 

 conditions. During fermentative processes, and especially in 

 dilatation of the stomach, the sarcina} are present in excess. 



It is a facultative aerobe, growing with moderate rapidity 

 and without liquefaction of the gelatin. The growth is usually 

 colorless, but in time becomes slightly yellowish. 



Sarcina pulmonum is found in the air-passages. Sarcina 

 lutea, S. aurantica, etc., are found in the air, and are color- 

 producing. In every other respect they resemble Sarcina 

 ventriculi. ' 



The Oppler-Boas bacillus is found in the stomach of per- 

 sons suffering with gastric carcinoma, and in diseases in which 

 the conditions in the stomach are the same as in carcinoma. 

 It is not distinctive of gastric carcinoma. It has never been 

 cultivated. 



Spirillum rubrum: This organism is of absolutely no clini- 

 cal importance, but serves as an example of the spirillum 

 class. Esmarch found it in the body of a mouse dead of 

 septicaemia. It varies considerably in length, is very motile, 



