212 BACTERIOLOGY. 



times motile, sometimes not. They are found in 

 various infusions and water of marshes. 



Spirillum sanguineum, Cohn (Ophidomonas 

 sanguined}. Threads 3 /x, and more in thickness, 

 with 2 2\ spirals, each 9 12 //, high, with their 

 ends provided with flagella. Their colour is due to 

 the presence of reddish granules contained in the 

 cells. They were observed in brackish water with 

 putrefying substances. 



Spirillum rosaceum, Klein. Resembles 

 Spirillum undula, but is reddish in colour; the 

 colouring matter is insoluble in water, alcohol, 

 or chloroform. 



Spirillum violaceum, Warming. Threads, 

 crescent-shaped, or possessing i or \\ spiral, with 

 their ends broad, rounded, and provided with 

 flagella. The colour is due to the contents, which 

 are violet. 



Spirillum Rosenbergii. Threads with i \\ 

 windings; 4 12 ft, long; 1*5 2*6 /x, 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. 



Spirillum attenuatum, Warming. Threads 

 much attenuated at the ends, which consist usually 

 of three spirals. The middle spiral is about 1 1 /x 

 high, and 6 p in diameter; and the end ones 10 //, 

 high, and 2 /x in diameter. They are found in 

 brackish water. 



