SPIRILLA RESEMBLING CHOLERA. 295 



ginning first upon the surface, where a large flat, saucer- 

 shaped liquefaction, extending to the sides of the tube, 

 forms. Scarcely any growth takes place in the puncture, 

 but the superficial liquefaction, separated by a horizontal 

 line from the normal gelatin, descends slowly. 



Upon agar-agar a grayish- white layer is formed. 



No growth has been obtained upon potato. 



In alkaline peptone solution a slow but luxuriant 

 growth takes place. 



Spirillum Milleri. This spirillum (Fig. 93) was found 

 in the mouth by Miller in 1885. It resembles the cholera 



FIG. 93. Spirillum Milleri, from an agar-agar culture; x 1000 (It2erott and 



Niemann). 



spirillum somewhat, but is much more like the spirillum 

 of Finkler and Prior, with which many bacteriologists 

 think it identical. 



Upon gelatin the colonies are small, finely granular, 

 have a narrow border-zone and a pale-brown color. The 

 gelatin is rapidly liquefied. 



Upon agar-agar a thick yellowish layer is produced. 



The organism seems not to be pathogenic. 



Spirillum Aquatilis. Giinther in 1892 found this or- 

 ganism (Fig. 94) in the water of the river Spree. It is 

 similar to the cholera spirillum in shape, has a long 

 terminal flagellum, and is motile. 



