290 Existence of Ice and other Bodies in the Solid State. [Jan. 6, 



Received December 16, 1880. 

 Appendix. 



Since writing the foregoing, it has been said in explanation of the 

 phenomena therein described, that the thermometer, though embedded 

 in the mass of the ice, did not really indicate the true temperature of 

 the latter. With the object, therefore, of proving whether the ice is 

 hot or not, I have, at the suggestion of Professor Roscoe, made the 

 following calorimetrical determination : — 



The arrangement of the apparatus was so modified, that the ice, 

 after being strongly heated, could be suddenly dropped into a calori- 

 meter containing a known quantity of water of known temperature. 

 The resulting temperature, after the ice had been dropped in, was 

 read off by a thermometer graduated so as to indicate a difference of 

 o, 05 0. The weight of the ice was found by re-weighing the calori- 

 meter. 



So far, I have only had the opportunity of completing the two 

 following determinations, and in the second of these the weight of the 

 ice could not be found, as a small quantity of water was lost out of the 

 calorimeter, owing to a sudden jerk at the moment the ice entered 

 it :— 



(1.) Weight of water in calorimeter, including the value of the 

 latter =185 grms. 



Weight of ice dropped m=l*3 grms. 



o 



Temperature of calorimeter before = 13 '4 

 ,, ,, after=13 '6 



Rise in temperature = '2 

 M(<9-0 + 80W =W(T-0) 

 (185 x 0-2) + (80 x l-3)=l-3(T-13-6) 

 . • . T=122° 0. Where T= temperature of ice. 



(2.) Weight of water in calorimeter, &c. = 185 grms. 



o 



Temperature of calorimeter before = 12 ■ 7 



after=12 "8 



Rise in temperature = "1 



On weighing the calorimeter after the experiment, the increase in 

 weight was only 0*15 grm., but as a portion of the water had been 

 jerked out during the operation, the true weight of the ice, and there- 



