BACTERIOLOGY. 



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



against the danger 

 h (f\\ resulting from acci- 

 dental extinction of 

 the gas, Professor 

 Koch has devised a 

 /* self-acting apparatus 

 (Fig. 20), which, 

 simultaneously with 

 the extinction of the 

 flame of the burner, 

 shuts off the supply 

 of gas. 



Babes' Incuba- 

 tor. The pattern 

 of Dr. Babes is 



FIG. 19. 

 MOITESSIER'S GAS-PRESSURE REGULATOR. 



very simple, and is recommended by the author 

 in preference to all others (Fig. 21). 



PIG. 20. KOCH'S SAFETY BURNER. 



It consists of a double-walled chest with sides 



