XI.] 



BACILLUS: PATHOGENIC FORMS. 



179 



These small, straight bacilli are non-motile, and when 

 grown artificially they form spores. Neither the comma- 

 bacilli nor these small bacilli show in their mode of growth, 

 in artificial cultivations in various media, greater peculiarities 

 than other kinds of bacteria. The peculiar mode of growth 

 of the comma-bacilli in gelatine mixtures is shown in the 

 accompanying woodcuts: 



FIG. 102. 



Pure cultivation of choleraic comma-bacilli in gelatine-peptpne-broth. The inocula- 

 tion had been made, not in a channel, as in the previous figures, but on the 

 surface. There is also here a depression of the growth on the surface, and in the 

 extent of the growth the gelatine is liquefied, with a whitish precipitate at the 

 bottom. 



Both the comma-bacilli and small straight bacilli grow 

 well in alkaline and neutral media, and are not killed by 

 weak acids although they do not show growth in them, or 

 only to a very limited degree. Neither the comma-bacilli 

 nor the straight small bacilli can be considered as connected 

 with the cause of cholera. 



The result of the experiments performed by Nicati and 



N 2 



