Calorific Power of various Liquids. 431 



were cooled in this experiment were equal to that of 

 204.3 g rammes of water ; viz., 



That of the water employed . . . . 180 grammes. 

 That of the vases and thermometer . ... 24.3 



Total . . . 204.3 



The capacity for heat of the bottle containing the oil was equal to 

 that of . . . . . 8.36 grammes of water. 



And to this we must add the cold water ad- 

 hering to the bottle, when it came out of the 

 cold water, and was plunged into the water 

 contained in the copper vessel. I found by a 

 particular experiment that this quantity of 

 water was . . . . . . 1.04 



Total . . . . 9.40 



Now, as the temperature of the warm water in the 

 cylindrical vase of copper was that of 59^- before the 

 mixture, and 56f after the communication of the heat 

 had been obtained, it is evident that this water was 

 cooled 2-f. But if we multiply the number of grammes 

 of water which the specific heat of this water represents, 

 and that of the vessel (= 204.3 grammes), by the number 

 of degrees which it has been cooled (2|-) we shall have 

 a product which will express the number of grammes 

 of water which would have been cooled i F. by a 

 loss of heat equal to that which the vessel and its con- 

 tents supported in this experiment. It is 204.3 X 2 -75 

 = 561.84 grammes. 



We shall now see what part of this heat was com- 

 municated to the bottle and to the small portion of 

 cold water attached to it, and what part to the oil con- 

 tained in the bottle. 



As the temperature of the bottle and its contents was 

 F. before the mixture, and 65^- afterwards, it is 



