STERILIZATION APPARATUS. 



43 



discontinued method at the temperature of streaming 

 steam gives the most satisfactory results. 



For sterilization by steam the apparatus commonly 

 employed has until recently been the cylindrical boiler 

 recommended by Koch, a cut of which may be seen in 

 Fig. 1. 



Fk;. 1. 



Its construction is very simple. It consists of a 

 copper cylinder, the lower fourth of which is somewhat 

 larger in diameter than the remaining three- fourths, and 

 acts as a reservoir for the water from which the steam 

 is to be generated. Covering this section of the cylinder 

 is a wire rack or grating through whicli the steam 

 passes, and which serves as a bottom upon which the 



