406 Mr. Graham on the Heat disengaged in Combinations. 



Twenty-third and twenty- 

 fourth equivalents: — 

 66°*66 

 62°-63 

 Fall 4°'03 

 Twenty-fifth and twenty- 

 sixth equivalents: — 

 66°-83 

 63°' 16 

 Fall 3°'67 

 Twenty-seventh and twenty- 

 eighth equivalents : — 

 66°-53 

 62°-97 

 Fall 3°-56 



Twenty-ninth and thirtieth 

 equivalents : — 



66°'57 



63°'24 



Fall 3°-33 



Thirty-first and thirty-se- 

 cond equivalents: — 

 66 o, 80 

 63°-57 

 Fall 3°'23 



Thirty-third and thirty- 

 fourth equivalents : — 

 66°-37 

 63°-24 

 Fall 3°-13 



Thirty-fifth and thirty-sixth equivalents: — 



66°'45 

 63°'50 



Fall 2°-95 

 Here we find that while the fall on the solution of the first 

 two equivalents of nitrate of ammonia is 8°'34, that of the last 

 two dissolved is only 2 0, 95, or little more than a third of the 

 former. The liquid, however, finally consisted of 1544 grains 

 of water and 1807*2 grains of salt, and would therefore have 

 a considerably greater capacity for heat than the water alone ; 

 but the proper correction for this increase of capacity cannot 

 at present be made, as the specific heat of nitrate of ammo- 

 nia has not been ascertained. 



The last solution of nitrate of ammonia, which was nearly 

 saturated for the temperature, was of density 1 0, 247. Three 

 portions of 100 gi'ammes of water were added to it in succes- 

 sion, to discover the cold produced on dilution. 

 First 100 grammes of water: — 

 Before mixture . 

 After mixture . . 

 Fall 



66°'83 



60°-27 



6°'56 



Second 100 grammes of water: — 

 Before mixture 

 After mixture . . . 

 Fall 



Third 100 grammes of water: — 

 Before mixture . 

 After mixture . . . 

 Fall 



67°*06 



64°-40 



2°-66 



67°'06 



65°-61 



l°-45 



