NON-PATHOGENIC MICROCOCCI. 603 



side of which a second and finally a third similar " Strahlenkranz " is 

 often developed; liquefaction progresses slowly about the colonies. In 

 gelatin stick -cultures feathery outgrowths occur at intervals along the line 

 of puncture, radiating horizontally into the gelatin ; liquefaction commences 

 near the surface as a pointed funnel and gradually extends downward. 

 Upon potato a yellowish-brown layer is quickly developed. 



191. DIPLOCOCCUS ALBICANS AMPLUS. 



Synonym. Gray- white micrococcus (Bumm). 



Found in mucus from the healthy vagina. 



Morphology. Diplococci resembling the " gonococcus " inform, but con- 

 siderably larger, from 2 to 2.8 ft in diameter; the diplococci are usually soli- 

 tary, but sometimes are in groups of three or four. 



"Biological Characters. An aerobic and facultative anaerobic, liquefy- 

 ing micrococcus. Grows at the room temperature in the usual culture me- 

 dia. Upon gelatin plates slightly elevated, grayish-white colonies are 

 formed. In gelatin stick cultures growth occurs upon the surface and along 

 the line of puncture as a grayish-white stripe ; after a time liquefaction com- 

 mences under the surface growth. 



192. MICROCOCCUS CANDICANS (Flugge). 



Very common in the air and in water. 



Morphology. Spherical cocci, from 1 to 1.2 M- in diameter, associated in 

 irregular groups. 



Biological Characters. An aerobic, non-liquefying micrococcus. Grows 

 in the usual culture media at the room temperature. Upon gelatin plates, 

 at the end of two days, the deep colonies are spherical and white or yellow- 

 ish in color, of from 0.4 to 0.5 millimetre in diameter ; under the micro- 

 scope they are seen to be finely granular, dark-brown spheres. Upon the 

 surface milk-white, shining colonies with irregular outlines, which under 

 the microscope are seen to be finely granular and to have jagged margins. 

 In gelatin stick cultures a confluent white growth forms along the line of 

 puncture, and a button-like mass upon the surface. Upon potato a slimy, 

 white layer is quickly developed. 



193. MICROCOCCUS CANDIDUS (Cohn). 



Found in water. 



Morphology. Small, perfectly spherical cocci, from 0.5 to 0.7 n in diame- 

 ter, united in zoo'gloea masses the intercellular zooglcea substance is soluble 

 in water. 



Biological Characters. An aerobic, non-liquefying micrococcus. Grows 

 in the usual culture media at the room temperature. Upon gelatin plates 

 forms snow-white colonies with irregular outlines, which under the micro- 

 scope are seen to be slightly granular. In gelatin stick cultures a flat, milk- 

 white layer is formed about the point of puncture; very scanty development 

 along the line of inoculation. Upon agar the same as on gelatin. 



194. MICROCOCCUS ACIDI LACTICI (Marpmann). 



Found in cow's milk. 



Morphology. Large cocci, solitary or in pairs. 



Biological Characters. An aerobic, non-liquefying micrococcus. Grows 

 in the usual culture media at the room temperature. Upon gelatin plates 

 forms at the end of twenty-four hours punctiform, yellowish-white, lustre- 

 less colonies. In gelatin stick cultures a thin, yellowish layer forms upon 

 the surface, which is thickest in the middle, thin and transparent at the 



