SPIRILLA RESEMBLING CHOLERA. 451 



In alkaline peptone solution a slow but luxuriant 

 growth takes place. 



Spirillum Milleri. — This spirillum (Fig. 104) was found 

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



1 *% 





/ 







FlC 104. — Spirillum Milleri, from an agar-agar culture; x 1000 (Itzerott 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. 105) in the water of the river Spree. It is 

 similar to the cholera spirillum in shape, has a loug 

 terminal flagellum, and is motile. 



The colonies which form upon gelatin are circular, 

 have smooth borders, and look very much as if bored out 

 with a tool. They have a brown color and are finely 

 granular. In gelatin puncture-cultures the growth occurs 

 almost exclusively at the surface. 



The agar-agar cultures are similar to those of cholera. 



Scarcely any development occurs in bouillon. By the 



