106 BACTERIOLOGY 



clumps of cocci, which appear on the very first day as 

 round white points on the gelatine plate, and these after 

 several days become yellowish-brown and in certain posi- 

 tions of the plate shimmer like mother-of-pearl. The latter 

 appearance is also seen on the surface of a thrust-culture 

 as well as on superficial cultures upon agar. The shimmer 

 sometimes strikes into a yellowish-green. Gelatine is not 

 liquefied. 



Micrococcus cinabareus. — The microbe so named by 

 Pliigge, and which is noticeable on account of its cin- 

 nabar colour, forms diplococci. On gelatine plates the 

 colonies do not appear for four to six days, and are reddish- 

 brown ; but the colour gradually changes to vermilion. A 

 thrust-culture also shows the colour on the surface in the 

 form of a red knob, from which a white stripe extends into 

 the gelatine, which is not liquefied. 



Micrococcus flavus tardigradus of Pliigge appears in 

 large single elements, and forms colonies which become 

 yellow in six to eight days. In the thrust-canal isolated 

 and disconnected yellowish balls develop. It is distin- 

 guished by its yellowish colour, and does not liquefy gela- 

 tine. 



Micrococcus candicans (Fliigge) often appears as a con- 

 tamination on gelatine plates, forming white colonies which 

 are darker in the centre and lighter towards the margin. 

 Thrust-cultures are nail-shaped with a nodular elevation. 

 Gelatine is not liquefied. 



Micrococcus viticulosus. — This micro-organism, described 

 by Katz, consists of oval elements, and is particularly cha- 

 racterised by the tendril-hke shapes of its colonies. These 

 appear both on and below the surface of the gelatine plates, 

 and send out lateral outgrowths in the form of fine pro- 

 cesses resembling tendrils. In thrust-cultures it grows 

 along the track of the puncture, from which a delicate net- 



