130 



ESSENTIALS OF BACTERIOLOGY. 



the gelatine liquefies, and then the growth settles at the bottom 

 of the tube. 



FIG. 73. 



FIG. 74. 



Appearance of culture of bacillus 

 of tetanus after agitating the lique- 

 fied gelatine. (Frftnkel and Pfeif- 

 fer.) 



Six days' culture of bacillus 

 of tetanus in gelatine (deep 

 stab). (Frftnkel and Pfeiffer. 



Agar. At brood-heat, on agar, the growth is quite rapid, and 

 at the end of forty-eight hours gas bubbles have formed and the 

 growth nearly reached the surface. 



