466 MICRO-ORGANISMS IN WATER 



BACILLUS GUTTATUS 



I LiaUEFIES GELATINE ( 



Authority. — Zimmermann, Die Bakterien unserer Trink- xtttd Nutswdsser, 

 i-jisbesondere des Wassers der Chemnitzer Wasserleitung, Chemnitz, 1890, 



Where Found.- In the Chemnitz water supply. 



Microscopic Appearance.— Short bacilli about 0-93 abroad, and from 1-0 to 

 1*13 fi 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 n moderately abundant dull slimy yellowish green 

 expansion. 



