262 BACTERIOLOGY, 



2 ^ thick, 25 30 fju long ; tapering towards their extremi- 

 ties, which are rounded off. They possess dark granular 

 contents. Each thread has 2\ 3^ windings or spirals, 

 whose height is 913 /*. They have a flagellum at each 

 end, and are sometimes motile, sometimes not. They are 

 found in various infusions and water of marshes. 



Spirillum Rosenbergii. Threads with i \\ 

 windings; 4 12 p long; 1*5 2'6 /u, thick. They are 

 colourless, but the contents include strongly refractive 

 sulphur granules. Also spirals 6 7*5 ^ in height, which 

 are actively motile, are found in brackish water. 



FIG. 100. SPIRILLUM UNDULA, x 1500. 



Spirillum attenuatum, Warming. Threads 

 much attenuated at the ends, which consist usually of three 

 spirals. The middle spiral is about 1 1 p high, and 6 p in 

 diameter ; and the end ones 10 //- high, and 2 pin diameter. 

 They are found in brackish water. 



Spirillum leucomelaneum, Koch. A rare form 

 observed in water covering rotting algae. Dark and glass- 

 like spaces alternate in the spirillum, resulting from a regular 

 arrangement of the dark granular contents. 



Genus IIL Leuconostoc. 

 SPECIES. 



UNASSOCIATED WITH DISEASE : 



Leuconostoc mesenteroides . . . Zymogenic saprophyte. 



Leuconostoc mesenteroides, Cienkowski 



(Gomme de sucrerie, Froschlaichpilz, Frogspawn 



fungus). Cells singly, in chains, and in zoogloea, 



