HOT-AIR STERILIZATION. 47 
(6) Place the objects to be sterilized in the 
chamber. 
(c) Close the door and turn on the steam, first 
allowing the air present in the chamber to escape. 
(d@) Bring the temperature to, say 120° C. ; allow 
it to remain there fifteen minutes. 
Fic. 23.—Arnold steam sterilizer, Boston Board of Health 
pattern. 
(e) Shut off the steam and allow the apparatus to 
cool well below 100° C. before opening the door 
or allowing the steam to blow off. 
III. Hot-air Sterilization. 
For glassware and other objects not liable to be 
