148 



ESSENTIALS OF BACTERIOLOGY. 



Properties. Not very motile, though distinctly so ; liquefies 

 gelatine slowly. The cultures give rise to a foul-smelling gas. 

 Growth. Develops very slowly, best at brood-heat (36 to 38 



FIG. 82. 



FIG. 83. 



Bacillus tetani : culture four days 

 old in glucose-gelatine (Frankel and 

 Pfeiffer). 



Six days' culture of bacillus 

 of tetanus in gelatine (deep 

 stab). (Frftnkel and Pfeiffer.) 



C.), and only when all oxygen is excluded, an obligatory ance.ro- 

 bin. In an atmosphere of carbon dioxide gas it cannot grow, 

 but in hydrogen it nourishes. 



