

QUALITATIVE BACTERIOLOGICAL ANALYSIS. 77 



gelatine is softened into a thick fluid, in which the surface 

 growth sinks. 



Micrococcus Versicolor. 



Described by Flugge and found in water by Tils. It consists 

 of small cocci arranged in pairs or masses. In gelatine-plates 

 the colonies in the depth appear after forty-eight hours as round 

 centres which have a yellow colour ; on the surface they form 

 large expansions of irregular shape, often four-cornered with 

 lobular projections; they are slimy yellowish-green in colour 

 and the centre is often raised. The gelatine is not liquefied. 

 In gelatine-stab small yellowish round colonies appear in the 

 stab ; on the surface there is a mother-of-pearl growth with an 

 irregular frayed edge. 



Micrococcus Viticulosus. 



Found by Flugge in air and water. It forms oval cocci of 

 variable size arranged in thick zoogloea masses. In gelatine- 

 plates the colonies in the depth form hair- like extensions from 

 the centre of the colony, which unite to produce a delicate 

 network. Under a low power the network is seen to consist of 

 zooglcea masses of cocci arranged side by side. On the surface 

 the colonies form thin rapidly-growing layers, from which fine 

 threads penetrate into the depth of the gelatine. In gelatine 

 streak it forms radial extensions from the line of inoculation, 

 producing an appearance like a feather. In gelatine-stab the 

 same network appears in the stab, which is soon covered up by 

 the thin rapidly growing surface expansion. 



Micrococcus Candicans. 



Described by Flugge and also by Frankland. It forms rather 

 large, round cocci, which are arranged in irregular heaps. In 

 gelatine-plates the colonies in the depth are white centres ; on 

 the surface they are smooth, of a pure milk-white colour, and 

 measure 2 mm. in diameter. Under a low power the deep colonies 

 appear circular, granular, and deep brown in colour ; the surface 

 colonies are slightly irregular at the margin, deep brown in the 

 centre but lighter towards the periphery. In gelatine-stab there 

 is a nail-like growth ; Frankland states that the gelatine is 



