igio.] 



WORK ON NUTRITIVE PROCESSES. 



149 



electric lamp, lOO calories, so it is necessary for us to bring away 

 the heat from the chamber as fast as it is liberated, or otherwise 

 the man would become uncomfortably warm. As in the winter our 

 houses are heated with hot water, this little house is cooled by 

 cold water. Through a series of pipes inside the chamber is passed 

 a current of cold water, then by noting the temperature at which the 



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Fig. 2. Horizontal section of the respiration calorimeter showing heat 



insulation. 



water enters and at which it leaves the chamber and the amount of 

 water passing through, it is very easy to determine the exact amount 

 of heat brought away in this manner. Thus this apparatus is well 

 named a respiration calorimeter, " respiration " because it is an 

 apparatus for measuring the respiratory processes and " calori- 

 meter " because it measures the heat given off by the subject. 



It is difficult for us to imagine that there may be heat or energy 

 in a glass of ice cream soda or a piece of toast or a slice of ham 

 and yet there have been one or two rather remarkable instances 

 where some of our foodstuffs have been by force of dire necessity 

 put to practical use for the production of heat. A few years ago 

 the farmers of Kansas had an over-supply of corn and with the 

 price of fuel as it was at that time, it became a common practice 



