DEtfEKE'S SPIRILLUM 479 



proceeds more rapidly, and the bell-shaped depression on the surface is 

 larger and shallower, whilst the growth has a more distinctly yellowish 

 tint. The colonies in plates also show points of resemblance, though the 

 youngest colonies are rather smoother and more regular on the surface, 

 and liquefaction occurs more rapidly than in the case of the cholera 



FIG. 142. Fiukler and Prior's spirillum ; from an agar culture 



of twenty-four hours' growth. 

 Stained with carbol-fuchsin. x 1000. 



organism. The colonies have, on naked-eye examination, a distinctly 

 yellowish colour. The organism does not give the cholera-red reaction, 

 and on potato it forms a thin yellowish layer when incubated above 

 30 C. When tested by intraperitoneal injection and by other methods, 

 it is found to possess very feeble, or almost no pathogenic properties. 

 Deneke's spirillum is usually regarded as a comparatively harmless 

 saprophyte. 



