BACTERIOLOGY. 



passes through a pressure regulator (Fig. 19). To provide 



against the danger 

 resulting from acci- 

 dental extinction of 

 the gas, Professor 

 Koch has devised a 

 7* self-acting apparatus 

 (Fig. 20), which, 

 simultaneously with 

 the extinction of the 

 flame of the burner, 

 shuts off the supply 

 of gas. 

 Babes' Incuba- 



FIG. 19. 

 MOITESSIER'S GAS-PRESSURE REGULATOR. 



tor. The pattern 

 of Dr. Babes is 

 very simple, and is recommended by the author 

 in preference to all others (Fig. 21). 



FIG. 20. KOCH'S SAFETY BURNER. 



It consists of a double-walled chest with sides 



