Microbes Must Eat 



71 



tainer at 100° C. (212° F. ), but as the elevation increases above 

 sea level, the boiling point decreases. On the top of Pikes Peak in 

 the Rocky Mountains of Colorado where the elevation reaches 

 14,109 feet above sea level, water boils in an open vessel at about 

 87° C. (187° F.). Persons residing in a locality that is appreciably 



Fig. 15. Ai-nold Sterilizer. (Manufactured by Wilmot Castle Com- 

 pany. Will Corporation catalog 25101.) 



above sea level should remember that boiling occurs at such low 

 temperatures that cooking periods often must be double that at 

 sea level where boiling takes place at a hotter temperature. It is 

 not the mere bubbling of water that determines effectiveness of 

 heating, it is the temperature at which this boiling occurs. 



