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 6 c 



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

 a. After twenty-four hours. 6. After forty-eight hours, c. After seventy-two 

 hours, 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 ulti- 



