134- BACTERIOLOGICAL EXAMINATION OF WATER. 



Gelatine-stab. Growth occurs at the surface and along the 

 line of inoculation ; the gelatine acquires a brown colour around 

 the growth, and is slowly liquefied at the surface in the form of a 

 cup. A white incrustation appears in the liquefied mass after a 

 few days. 



Agar. There is a thick adherent growth, which later 

 becomes covered with a white incrustation. The medium 

 acquires a brown colour. 



Broth. A white growth appears on the surface and a deposit 

 forms at the bottom ; the intermediate portions of the medium 

 are quite clear. 



Glucose-gelatine (shake). There is no gas formation. 



Milk. A white growth appears on the surface, but the milk 

 is not coagulated. 



Potato. There is a localised greenish-yellow growth, which 

 becomes covered with a white incrustation. 



Microscopical Appearance. In a hanging-drop long branching 

 filaments, with hyaline contents, are seen. The long filaments 

 break up into smaller segments, which appear to be motile and 

 have a tendency to form zooglo2a masses. 



