108 BACTERIOLOGY 



a lemon-yellow colour ; the thrust-culture slowly liquefies 

 the gelatine, a yellow mass being found in the deeper part. 

 Surface cultures on agar exhibit a lemon-yellow coating, 

 which later becomes brownish. 



Micrococcus flavus liquefaciens and Micrococcus desidens. 

 — Both have been described by Fliigge. The former has 

 larger, the latter smaller elements frequently arranged as 

 diplococci, and both form yellowish-coloured collections on 

 discs of potato. On gelatine plates small round yellowish 

 colonies occur, which begin to liquefy the gelatine in from 

 one to two days. Thrust-cultures liquefy in a few days, 

 earlier in the case of Micrococcus liquefaciens than with 

 Micrococcus desidens, and when the elements have sunk to 

 the bottom of the funnel-shaped fluid area, a slight yellow 

 coloration forms below. 



Sarcina alba. — The Sarcina alba grows slowly on gelatine 

 plates in little round white colonies, and in the same manner 

 along the track of the thrust in the test-tube, forming in 

 the latter a small white head on the surface. It also grows 

 very slowly on potatoes, in the form of a whitish-yellow 

 deposit round the site of inoculation. Gelatine is very 

 slowly and only very slightly liquefied. 



Sarcina Candida. — The microbe of this name, found by 

 Eeinke in breweries, shows shining white colonies on 

 gelatine, which later become yellowish and very soon 

 liquefy. On agay there appears a white deposit with smooth 

 edges. 



Sarcina aurantiaca. — Small smooth-edged colonies appear 

 on the gelatine plate, having a dotted granular aspect when 

 seen under a low power, and an orange-yellow colour. 

 Thrust-cultures liquefy slowly along the entire track, and 

 excrete an orange-yellow pigment at the surface ; but when 

 they have stood for a longer time, the principal mass sinks 

 to the bottom and the superficial part of the medium 



