17- I^CTKRIA AND THE GUM OF LIXSKKD MUCILAGE, 



AVai.'«<>h to Unij^^nitur^^ e/<*. — Slime is pixxiuccd at 22", and 

 there is uo growth under the mica plate. 



(r/»iOL\*r'-<7#/<i^iH<' }>i<iU. — The colonies do not grow so freely as 

 many other slime bacteria. They are white and raised and dull 

 with an irregular margin. The centre of the colony is raised 

 above the remainder, and from the base of the i*aised centre 

 short furrows radiate out half-way to the edge. Mici\>scopiciilly, 

 the structure is coarsely granular, much more so than the colonies 

 of Ra^L a^j'ciir: the granular masses are aggregated in the middle 

 and the margin is practically homogeneous and non-granular. 

 While the surface colonies are yellow and translucent, the deep 

 colonies are circular, brown, and clouded or opaque. By the 

 sixth day. the colonies have become depressed centrally and the 

 colour has altei^ed to pale buff. 



XHiri<£Hi a^ar />/«#«?, — The white coionies are always thin or 

 flat and semi-transparent: they tend to spread either in a circular 

 or an amivboid manner. Microscopicallyj the colony is yellowish 

 and transparent, with large loose granules in the centra?: the deep 

 cs>lonies are irregular, translucent and granular. 



Gfiuose-ffdatina stab. — ^The growth is filiform, with a flat, 

 siuik(»i white nail-head which becomes broad. semi-Transparent 

 and dry, while the centre sinks and the subsurface geiatiue 

 becomes liquefied in a napif orm manner. 



Qiwca^^-geiatiHa iirohs, — It develops as a narrow, white, raised, 

 dry growth with a somewhat lobular margin. The medium under 

 the growth slowly liquefies. 



JTM-frsV^!/ a^ar sfr&ke, — The stroke at first is broad, flat and 

 pale buflpj with a smooth edge: the infection line becx-»mes raised 

 and rough frooi the formation of minute wrinkles. 



Sa^ockar(^i>e-p<j4a^<iMs^ar ^roi>€, — The growth is at nrst, raised, 

 buff and glistening : the edge is smooth and the cross-section 

 angular. The culture spreads out, the margin becomes lobular 

 and the surface contoured. 



PtitaliK — A moist-glistening, raised, bufl^ spreading growth 

 which deepens in colour to yellow. 



