BACILLUS VIOLACEUS 349 



Bacillus Violaceus (B. Jathinus). — This organism has 

 been found by various investigators in water. It occurs in 

 rods of different lengths, the longer of which may be bent. 

 The rods are from 1'5 to 3"5 m long by 0"65 fi broad, and 

 are motile. Cultural characters : 



Gelatine Plates. — In the depth the colonies are seen as 

 small white dots, but on the surface they form small 

 grayish circular discs. After five days they are seen as 

 shining, drop-like, grayish-yellow expansions. When the 

 colonies are older, delicate concentric rings are visible in 

 and round the colony. 



Gelatine Tubes. — Forms a white expansion, which 

 gradually assumes a violet-blue colour. Afterwards the 

 growth sinks; owing to the slow liquefaction of the gelatine. 

 No pigment forms in the depth. 



Agar-Agar. — An abundant growth forms, which is yellow 

 or brownish in colour, and after a few days becomes of a 

 deep violet colour. 



Potatoes. — Forms a very deep violet expansion. 



Micrococcus Violaceus. — This organism occurs in water, 

 and in the air, etc. They occur as small, somewhat ovoid 

 cocci, in the form of streptococci. It is non-motile. Cul- 

 tural characters : 



Gelatine Plates. — Forms slimy, drop-like colonies of a 

 violet colour. 



Gelatine Tubes. — Forms a violet expansion. No lique- 

 faction of the gelatine takes place. 



Potatoes. — A violet-blue growth is formed, which after- 

 wards becomes darker in tint. 



