220 FARMYARD MANURE 



white, round, semi-transparent, and somewhat slimy; some of 

 them grow and reach a diameter of about 10 mm. in a week or 

 ten days at 22 C. The "stab" is threadlike, white, and raised 

 at the surface. 



Urea gelatine (p. 224). On this medium the colonies are 

 surrounded by a ring of small crystals. 



Agar. Surface colonies are white with a somewhat pearly 

 iridescence. 



Bouillon. This medium is rendered turbid in a day or two 

 and a precipitate is produced. 



Urea bouillon. It grows rapidly in 2 per cent, urea bouillon, 

 and the urea soon disappears. 



M. ureas liquefaciens, Fliigge, is a uro-coccus, 1.25 to 2 /a in 

 diameter, single, or three to ten cells in a chain. On gelatine its 

 colonies are round, dark grey at first, yellowish-brown later, with 

 a dark centre and wavy border. The " stab " liquefies in 

 funnel-shape, the liquefied part becoming turbid, and deposits a 

 yellowish-white precipitate. 



Urococcus Dowdeswelli, Miquel, is an aerobic organism 

 common in air, water, and the soil, oval, 2 to 3 /* long and i (J. 

 broad, usually met with singly or in pairs, but may grow into 

 short chains. It does not form spores. 



Gelatine. The surface colonies are non-liquefying at first, 

 later yellow; the "stab" is nail-like with a hemispherical 

 head. 



Agar. On agar its colonies are yellow and soon extend to 

 considerable size. 



Potato. Yellow growth. 



Bouillon, becomes turbid with yellow deposit. 



Urosarcina Hansenii, Miquel, is a coccus occurring in tetrads, 

 or irregular heaps. 



Gelatine. The surface colonies are non-liquefying, small and 

 yellow. 



Bouillon, is rendered only slightly or not at all turbid, but a 

 yellow sandy precipitate appears in a few days. 



