408 



BACTERIOLOGY. 



along the deeper parts of the needle-track are much 

 more pronounced than is the case with the ''comma 

 bacillus. ' ' 



Fig. 86. 



a i c d 



Stab-culture of vibrio Metchnikom in gelatin, at 18° to 20° C. 



n. After twenty-four hours, i. After forty-eiglit hours, c. After seventy-two 



houra. d. After ninety-six hours. 



Its growth on agar-agar is rapid, and after twenty- 

 four to forty-eight hours there appears a grayish de- 

 posit having a tendency to take on a yellowish tone. 



On potato at 37° C. its growth is seen as a moist, 

 coffee-colored patch surrounded by a much paler zone. 

 The whole growth is so smooth and glistening that it 

 has almost the appearance of being varnished. 



In bouillon it quickly causes opacity, with the ultl- 



