THE CULTIVATION OF MICRO-ORGANISMS 



131 



Fig. 55. — Bottle for tube cultures. {After Novy-) 



Pig. 56. — Apparatus for Petri dishes or tubes- 

 gas or pyrogallate method. {After Novy.) 



Pig. 57. — Apparatus for plates 

 or tubes — gas, pyrogallate or vac- 

 uum method. {After Novy.) 



