118 A MANUAL OF BACTERIOLOGY 



egg albumin in a damp chamber placed in the 

 incubator (see Figs. 22 and 14). The pigment pro- 

 duced is a red colour. 



Micrococcus flavus tardigmdus. Colonies of this 

 microbe form raised drops of a chrome-yellow colour. 

 In test-tube cultivations, they form small yellow 

 beads along the track of the needle. This microbe 

 does not liquefy the gelatine. 



Micrococcus flavus liquefaciens. The microbe 

 grows in colonies of a yellow colour, and the cells 

 form diplococci and zooglea. They liquefy the 

 gelatine. 



Micrococcus versicolor. Small cocci forming iri- 

 descent colonies. The colonies are flat, not raised \ 

 and in test-tubes the yellowish colonies have the 

 appearance of small beads, i.e. along the needle track. 

 These cocci are found in pairs or in masses. 



Micrococcus flavus desidens. This microbe occurs 

 in the dust of the atmosphere. The cells are 0*8 p 

 in diameter, and occur singly, as diplococci, and in 

 short chains. They form yellow colonies, which 

 ultimately sink down in the gelatine. The yellow 

 pigment is only formed at the surface of the gela- 

 tine, for in the track of the needle the colonies are 

 white. 



Micrococcus citreus conglomerate. The cells are 

 1'5 fju in diameter, and occur in the atmosphere and 

 in blennorrhoeic pus. On gelatine plates they form 

 citron yellow colonies. 



Micrococcus cereus flavus. The cells are 1'5 //, in 

 diameter, and occur singly, in lemon-yellow groups, 

 or in short chains. They are found in pus. 



