218 CLASSIFICATION OF THE MICRO-ORGANISMS. 



Micrococcus candicans. 



Moderately large micrococci, completely round ; unite 

 together to form irregular masses. In gelatine plates 

 the colonies lying in the substance of the jelly present 

 after two days the appearance of white discs with a 

 tendency to yellow 0*4 0*5 mm. in diameter ; those 

 which lie on the surface form within the same time pure 

 milk white flat colonies like drops of varnish, and with 

 a diameter of 2 mm. or more. Under a low power the 

 deep colonies are quite circular, with smooth margins, 

 and of a dark blackish brown colour with indications of 

 a granular surface ; the superficial colonies present 

 irregular contours, often indented and sinuous ; the sur- 

 face is finely granular, and in correspondence with this 

 shows under a somewhat higher power (100 diameters) 

 a finely jagged border. In the middle the colonies are 

 dark brown, but become clearer towards the border, 

 which is quite transparent. In puncture cultivations 

 there are confluent white masses and a knob-like eleva- 

 tion (nail cultivation) on the surface at the entrance of 

 the canal. An extremely frequent impurity on plates, 

 &c.* 



Micrococcus cinnabar eus. 



Large spherical micrococci often in the form of diplo- 

 cocci, each half however being completely round ; often 

 arranged in threes and fours. Grows extremely slowly ; 

 after 4 days the colonies lying in the depth are puncti- 

 form and just recognisable, while those placed super- 

 ficially have attained a diameter of 0*5 1 mm. ; after 

 about 8 days the latter are elevated above the gelatine 

 in a knob-like form. The colonies appear at first of a 

 light wax-red colour, later cinnabar red. Under a low 

 power the youngest deep colonies are egg or lentil- 

 shaped, with sharp contour, and of a dark reddish-brown 

 colour. The superficial colonies are light brown, trans- 

 parent at the margins, round but with a somewhat 

 irregular contour, due to projecting heaps of cocci. In 



* Gottinger hygienisches Institut. 



