HIGH PRESSURE STEAM 125 
was determined for B. typhosus and was reported to be 1.635 per 1° C. 
or 136 per 10° C. Here again the killing of bacteria in the presence 
of water was found to be analogous to the “ heat coagulation ” of their 
constituent proteins. 
Tig. 38.—Autoclave or Dressing Sterilizer, Kny-Schereer Type. 
The autoclave may be used for sterilizing many pieces of apparatus 
and many media. It has the advantage over other methods of taking 
less time. It has been recently shown that less hydrolysis of poly- 
saccharides is secured in the autoclave than in the Arnold. This is 
contrary to what was believed, for it is stated in many places that 
