502 MlCEO-ORaANISMS IN WATER 



MICEOCOCCUS FLAVUS DESIDENS 



I LIQUEFIES GELATINE | 



Authority. — Flligge, Die Mikroorg.anismen, 1886, p. 177. 



Where Found.— In air and water. 



Microscopic Appearance. — Small cocci arranged chiefly as diplococci, but 

 also in a triangular form, and in short chains. Not motile. 



Cultures. — 



GeiiAtine Plates. — In two days the colonies are visible as small white 

 yellowish dots. Under a low power they are oval and often have a lobular 

 projection on one side, yellowish brown in colour, and finely granular. The 

 surface colonies have a lighter zone near the periphery. After four days the 

 depth colonies have hardly changed, but those on the surface are from 5 to 10mm. 

 large, and are circular and lobular, and of a pale yellow or brownish colour. 

 They form a smooth slimy expansion, but neither rise above the surface nor 

 sink much below it ; later, however, the colony slowly sinks, and becomes sur- 

 rounded by a very flat circular depression. 



Gelatine Tubes. — Produces a confluent porcelain-white growth in the depth, 

 and a yellowish brown slimy expansion on the surface, which, however, does 

 not reach the walls of the tube. After eight days the gelatine below is so 

 softened that it liquefies, forming a thick fluid, the surface gradually sinking to 

 the bottom. 



Potatoes. — Forms a yellowish brown, thick and slimy expansion, with an 

 irregular periphery. 



MICEOCOCCUS FLAVUS TARDIGEADUS 



Authority.— Fliigge, Die Mikroorganismen, 1886, p. 175. 



"Where Found. — In air and water. 



Microscopic Appearance. — Large round cocci, exhibiting sometimes charac- 

 teristic dark poles. It is arranged chiefly in groups. 



Cultures. — 



Gelatine Plates. — It grows extremely slowly. The depth colonies are 

 dark chrome yellow, and either round or oval in shape. The surface colonies 

 have a smooth sealing-wax-like surface, and project slightly above the level of 

 the gelatine. Under a low power the depth colonies are circular and smooth- 

 rimmed, and of a uniform dark olive-green colour ; the surface colonies towards 

 the periphery are lighter in colour, being more of a greyish yellow tone. No 

 liquefaction takes place. 



Gelatine Tubes. — In six to eight days a number of isolated round yellow 

 colonies become visible along the path of the needle in the depth. 



