362 



BACTERIOLOGY. 



from 20 to 22 C., the entire gelatin is usually con- 

 verted into a yellowish-white fluid. Under these con- 

 ditions its growth is accompanied by a marked aromatic 

 odor, impossible to describe ; this is especially the case 

 when the liquefaction is far advanced. 



FIG. 70. 



abed 



Stab culture of the Finkler-Prior bacillus in gelatin at 18 to 20 C. 



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



hours, d. After ninety-six hours. 



In stab cultures in gelatin at the room temperature, 

 liquefaction is noticed about the upper part of the 

 needle-track iu twenty- four hours. This condition 

 gradually increases, and at the end of two or three days 

 the entire upper portion of the gelatin has become con- 



