STERILIZATION 



47 



at the usual pressure of the atmosphere in streaming 

 steam. For this purpose a double-jacketed boiler 

 with the steam introduced into the inner chamber 

 (Arnold steam sterilizer) is used. 



FIG. 15. Erlenmeyer 

 flask. 



FIG. 16. Petri 

 dish. 



FIG. 17. Fermen- 

 tation tube. 



SL r> 



FIG. 18. Autoclave, pattern of Wiesnegg: A, external appearance 

 B, section. 



