CALORIMETRY. 



equations, rrom which we eliminate the heat of combustion of 

 the substance and deduce thence the value in water of the 

 cylinder, etc. 



This method, suggested by Berthelot, may be replaced by 

 the following, to which he gives the preference: 



Pour into the calorimeter a certain quantity of warm 

 water, at 60 C. for instance. This water is previously con- 

 tained in a bottle, and the temperature is measured by a 

 thermometer placed inside. As control, operate first without 

 the bomb in the cylinder and afterwards with it in place. 



One test of this kind gave Berthelot a value of 354 calories 

 for the bomb. The value deduced by calculation from specific 

 heat was 355.4. Below is the detailed calculation giving the 

 separate parts of the bomb. 



RECAPITULATION. 



