SYSTEMATIC AND DESCRIPTIVE. 221 



in test-tubes they form yellowish beads in the 

 needle track, which remain isolated, and do not 

 liquefy the gelatine. Isolated from contaminated 

 cultures. 



Micrococcus versicolor, Flugge. Small 

 cocci, which form iridescent colonies. In test-tubes 

 they grow in the form of yellowish beads, and 

 develop an iridescent layer on the surface. 



Micrococcus viticulosus, Flugge. Oval 

 cocci, i '2 p. in length, and i //, in width. In plate- 

 cultivations the colonies differ when embedded in 

 the nutrient medium and when growing on the 

 surface. The characteristic appearance consists of 

 a delicate network, which is visible also in test- 

 tube cultivations in the track of the needle. On 

 the surface of the medium they form a viscous 

 layer. They were isolated from contaminated 

 cultivations. 



Micrococcus lacteus faviformis, Bumm and 

 Bockart. Cocci 1^25 /x in diam. Cultivated in 

 gelatine they form milk-white confluent colonies, 

 and preparations made from the cultivations have 

 a characteristic honeycomb appearance. Isolated 

 from vaginal secretions, and from sputum. 



Micrococcus fulvus, Cohn. Cocci round 

 1*5 ^ in diam., frequently in pairs. They form 

 rusty-red conical drops of a firm consistency, and 

 about *5 mm. diam., on horse dung. 



