58 



BACTERIOLOGY. 



generation of steam in a chamber from which it cannot 

 escape when the apparatus is closed. Upon the cover 

 of this chamber is a safety-valve, which can be regulated 

 so that any degree of pressure (and coincidently of tem- 

 perature) that is desirable can be maintained within the 



Kg. 10. 



Autoclave or digester for sterilizing by steam under pressure. 



sterilizing chamber. These sterilizers are known as 

 " digesters " and as " autoclaves." Their construction 

 can best be understood by reference to Fig. 10. 



