Mr. Graham on the Heat disengaged hi Combinations. 405 



A second portion of 1544- grains of water being added to 

 the above solution, occasioned a further fall of temperature : — 

 Before mixture . . 63°-57 

 After mixture . . . 63°'19 



Fall "0^38 



It appears from these experiments on the solution of suc- 

 cessive equivalents of nitrate of potash in the same quantity of 

 water, that much of the cold on dissolving that salt is pro- 

 perly referable to the dilution of the solution, and not to the 

 simple liquefaction or solution of the crystalline salt. But 

 this is more obvious in dissolving a salt of great solubility, 

 such as nitrate of ammonia, of which many more equivalents 

 may be dissolved in succession. 

 Dissolved in 1544 grains of water, 

 100*4 grains, or 2 equivalents of nitrate of ammonia : — 

 66°-25 

 57°'91 

 Fall 



Third 

 lents : — 



and fourth equiva- 



equiva- 



66°-43 



58°-91 



Fall 7°'52 



Fifth and sixth 

 lents : — 



66°-21 



59°-36 



Fall 6°-85 



Seventh and eighth equiva- 

 lents : — 



66°' 10 



59°'82 



Fall 6°'28 



Ninth and tenth 

 lents : — 



66°-26 

 60°-41 

 Fall 5°-85 

 Eleventh and twelfth equi- 

 valents : — 



66°*53 



61°-06 



Fall 5°'47 



equiva- 



°-34 



Thirteenth and fourteenth 

 equivalents : — 



66°-45 



61°-29 



Fall 5°-16 



Fifteenth and sixteenth 

 equivalents : — 



66°-47 



61°-55 



Fall 4°-92 



Seventeenth and eighteenth 

 equivalents : — 



66°'61 



61°-99 



Fall 4°'62 



Nineteenth and twentieth 

 equivalents : — 



66°*26 

 61°'91 



Fall 4°-35 

 Twenty-first and twenty- 

 second equivalents: — 

 66°-58 

 62°-45 

 Fall 4°-l3 



