252 



BACTERIOLOGY. 



about twenty-four hours. Liquefaction sets in very 

 slowly, commencing at the top of the needle 



FIG. 86. COLONIES OF KOCH'S COMMA BACILLI, x 60 ; from a nutrient 

 gelatine plate-cultivation. 



track around an enclosed bubble of air, and form- 

 ing a funnel continuous with the lower part of the 



r 



tfUfc'i 



w ',// A 



',i ii V 



Fig. 87. Fig. 88. 



FIG. 87. COVER-GLASS PREPARATION FROM THE CONTENTS OF A CHOLERA 

 INTESTINE, x 600. (a) Remains of the epithelial cells ; (b) Comma 

 bacillus ; (c) Group of comma bacilli [after KochJ. 



FIG. 88. COVER-GLASS PREPARATION OF CHOLERA DEJECTA IN DAMP 

 LINEN (two days old), X 600. Great proliferation of the bacilli with 

 spirilla (a) [after Koch]. 



growth (Plate III., Fig. i) ; the latter preserves 

 for several days its resemblance to a white 



