466 CHOLERA 



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 



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FIG. 138. Fiukler and Prior's spirillum ; from an agar culture 



of twenty-four hours' growth. 

 Stained with carbol-fuchsin. x 1000. 



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. 



