SPIRILLUM CHOLERZ ASIATICH. 569 
choleraic origin; Finkler and Prior, for instance, found 
them in the diarrheeic stools of cholera nostras, Deneke 
in cheese, Lewis and Miller in saliva. All of these 
organisms, however, differed in many respects from 
Koch’s comma bacillus, and since then it has been 
proved that none of them was affected by the specific 
serum of animals immunized to cholera; and gradually 
the exclusive association of Koch’s vibrio with cholera 
Fie. 74. 
Contact smear of colony of Contact spirilla preparation from plate 
cholera spirilla from agar. culture of cholera,  X< 800 diameters. 
> 700 diameters. (DUNHAM.) (DUNHAM.,) 
became almost generally acknowledged. It is now re- 
garded by bacteriologists everywhere to be the specific 
cause of Asiatic cholera. 
Morphology. Curved rods with rounded ends which 
do not lie in the same plane, from 0.8» to 2y in length 
and about 0.4 in breadth. The curvature of the rods 
may be very slight, like that of a comma, or distinctly 
marked, particularly in fresh unstained preparations 
of full-grown individuals, presenting the appearance 
of a half-circle. By the junction of two vibrios 
S-shaped forms are produced, and under unfavorable 
