SPECIES DESCRIBED BY VARIOUS WRITERS. 2 1 I 



saliva, in old cheese, and sometimes in water. 

 They differ materially from the spirillum of Asiatic 

 cholera in their behaviour to nutrient media. 

 Many have failed in the attempt to cultivate the 

 comma-bacillus of the mouth, others have only 

 succeeded by employing an acid nutrient jelly, in 

 which the appearances differed completely from the 

 characteristic growth of the comma bacillus of cholera. 



Spirillum serpens, Miiller {Vibrio serpens). 

 Threads 1 1 28 /x long, '8 ri ft thick, with three 

 or four windings. They are actively motile, often 

 united into chains, or forming swarms, and are 

 abundant in stagnant liquids. 



Spirillum tenue. Very thin threads, with at 

 least i, usually 2 5 spirals. Height of a single 

 screw is 2 3 /x, and the length of spiral, therefore, 

 4 15 /x. They are very swiftly motile, and often 

 occur in felted dense swarms in vegetable in- 

 fusions. 



Spirillum undula. Threads n 1*4 p, thick,. 

 9 12 /x, long; spirals 4*5 /A high; each thread 

 has 1 1- 3 spirals. They are actively motile, and 

 possess at each end a flagellum. They occur 

 in various infusions. 



Spirillum volutans, Ehrenberg. Threads 1*5 

 2[L thick, 25 30 /x long; tapering towards their 

 extremities, which are rounded off. They possess 

 dark granular contents. Each thread has 2~- 

 3^ windings or spirals, whose height is 9 13 /x. 

 They have a flagellum at each end, and are some- 



