DESCRIPTIONS OF PATHOGENIC BACTERIA. 185 



Fig. 27. Cholera asiatica. 



J, Comma bacilli, 1-4 after drawings ; 4, twisted coil, so-called 

 Spirodiscus, (about I : 1200) ; 5, 6, spiral filaments with spir- 

 ulina twistings (after photographs, about i : 700). 



B. Ripe arthrospores (after photographs), about i : 1000. 



C. i and 2, Arthrospores in filaments (after van Ermenghem, 

 from photograph), about I : 700. 



3-7, germinating arthrospores (after photographs by Pertik, 

 I : 1200). 



of rods curved like a comma and frequently bent 

 far around like a crescent ; often, however, they 

 appear perfectly straight. They grow out in- 

 to S forms and long corkscrew filaments, the 

 spirals of which are sometimes closely, some- 

 times loosely wound. Both the formation and 

 germination of arthrospores have been ob- 

 served. On our system of classification, then, 



