466 MICRO-ORGANISMS IN WATER 



BACILLUS GUTTATUS 



LIQUEFIES GELATINE 



Authority. Zimmermann, Die Bakterien unserer Trink- und Nutziocisser, 

 insbesondcre des Wasscrs der Chemnitzer Wasserlcitung, Chemnitz, 1890. 



Where Found.- In the Chemnitz water supply. 



Microscopic Appearance. Short bacilli about 0-93 ^ broad, and from 1-0 to 

 1*13 /J. long, at first found singly or in pairs, but later hanging together in larger 

 numbers. Very motile. Appears to form round spores. 



Cultures. 



GELATINE PLATES. In the depth small grey white dots, which on reaching 

 the surface resemble small bluish grey drops. Under a low power the depth 

 colonies are bluish or greyish brown in colour, smooth-rimmed, circular, and 

 granulated. The surface colonies are also smooth-rimmed, but the brownish 

 colour is confined to the centre, the edge being colourless. Later the contour 

 becomes slightly irregular sometimes. 



GELATINE TUBES. Forms a bluish white shining expansion having an ir- 

 regular contour. The growth is very abundant in the depth, and appears to 

 consist of numerous round ball-shaped colonies lying close together. The 

 gelatine is slowly (after four weeks) liquefied. 



AGAR-AGAR. Forms a thin grey white expansion, for the most part restricted 

 to the inoculation line. 



POTATOES. Produces a moderately abundant dull slimy yellowish green 

 expansion. 



