ASIATIC CHOLERA 



121 



stantly found in the excreta of persons suffering from 

 cholera, in the mild cases of choleraic diarrhoea 

 as well as in the severe and fatal form of the disease. 

 Fortunately for the human race, this cholera spirillum 

 is a tender exotic which has not succeeded in estab- 

 lishing itself permanently in Europe and America. 

 Although not killed by cold, its epidemic extension is 



I'/ i 



. ( 



^i 



to *' s ^ ' *<?\ 



> - '_ A - + tf** 

 c n, , 'J V ^ ^ 



V ' 



ti v ' > * i, * 

 ,T? ; 



FIG. 2. Spirillum of Asiatic cholera (" comma bacillus of Koch ") ; magni- 

 fied jooo diameters. 



arrested upon the approach of winter ; and our brief 

 historical review of its prevalence, outside of its home 

 in India, shows that after a period of longer or 

 shorter duration the disease dies out and does not 

 occur again independently of a fresh importation. 

 Under favourable conditions as to temperature, the 

 cholera spirillum multiplies in well or river water, 



