Invasion of the Udder by Bacteria. 



295 



Micrococcus No. 6. 



Morphology. — A micrococcus about 1/^- in diameter. 



Staining. — Stained readily by the common anilin dyes in use in 

 the laboratory. 



Agar. — The colonies are circular, viscid, white, but assume a 

 cream color later. The growth on agar slant cultures is white, 

 shiny, pasty, witli an irregular border. The condensation water is 

 clouded with flocculent sediment. 



Alkaline houillon. — The liquid becomes clouded with the depo- 

 sition of a whitish sediment, easily disseminated by agitation. 



Ten per cent gelatin. — Colonies are circular, varying in color 

 from cream to ocher, and each occupying a slight indentation in the 

 medium. Later, the area of liquefaction becomes larger and the 

 colonies disintegrate into grandular masses floating in the liquid. 

 In the stab cultures the needle's path is marked by a white dotted 

 growth, more abundant near the surface. The liquefaction extends 

 downwards in a few days forming a liquefied area involving the 

 whole width of the medium. The center becomes liquefied some- 

 what in advance of the edges, forming a cone-shaped liquefaction. 



Milh. — It remains fluid even after months, with the accumulation 

 of a yellowish sediment in the bottom of the tube. Litmus milk is 

 unchanged in color. 



Fermentation tuhe. — Growth in one per cent solution of glucose, 

 lactose and saccharose in bouillon occurs only in the open arm of 

 the tube. The reaction remains alkaline. 



TABLE No. YIII. 



The Sources from which Pure Cultures of Micrococcus No. 6 



were Obtained. 



