QUALITATIVE BACTERIOLOGICAL ANALYSIS. 133 



cultures longer forms are seen. It is very motile and possesses 

 a flagellum at one end. According to Flugge it forms spores, 

 though this is denied by other observers. 



Micrococcus Urese. 



This name was given by Pasteur to the organism which 

 converted urea into ammonium carbonate. Leube described 

 the following biological characteristics : It is a medium-sized 

 coccus, which usually occurs as diplococci, sometimes as tetrads 

 and long chains. In gelatine plates the colonies appear as 

 smooth, mother-of-pearl like growths, which in ten days grow 

 out to the size of a sixpence and look like drops of wax ; under 

 a low power the margin is finely granular and the centre 

 opaque ; the gelatine is not liquefied. In gelatine stab it 

 forms a thin, tough, thread-like growth along the inoculation 

 line. 



Micrococcus Urese Liquefaciens. 



This micro-organism was isolated in Fliigge's Institute ; it 

 also rapidly converts urea into ammonium carbonate. It forms 

 large cocci, which are arranged in chains or masses. After two 

 days the deep colonies appear as small white points, which, under 

 a low power, are seen to be granular ; on reaching the surface 

 the colonies form yellowish-brown discs, often with a cavity in 

 the centre ; the margin is irregular, and liquefaction slowly 

 takes place. In gelatine stab there is a white growth along the 

 stab, the gelatine is soon liquefied, and the tube becomes filled 

 with fluid containing a yellowish-white deposit. 



Cladothrix Dichotoma. 



This organism was first described by Cohn. It is found in 

 fresh and stagnant water, and especially in water rich in organic 

 matter ; it is also common in sewage. 



Gelatine Plates. Small yellow dots appear in four or five days ; 

 each growth is surrounded by a brown colour, which gradually 

 extends over the gelatine. Under a low power, each colony is 

 seen to consist of a mass of branching threads closely felted 

 together and strongly resembling a mould. Later a white 

 mouldy growth forms on the surface of the colonies, and the 

 gelatine is slowly liquefied. 



