62 



BACTERIOLOGY. 



regulated so that any degree of pressure (and coinci- 

 dently of temperature) that is desirable can be main- 

 tained within the sterilizing chamber. These sterilizers 



FIG. 11. 



Autoclave or digester for sterilizing by steam under pressure. 



are known as " digesters" and as "autoclaves." 

 Their construction can best be understood by reference 

 to Figs. 10 and 11. 



