1820.] SoluhiUty of the Salts in Water. 9 



necessity, in order to compare its solubility with that of other 

 salts, increase each number of solubility by the same number 

 multiplied into the ratio of 22-65 to 131-1, and diminish by 

 as much the quantity of water. On making this correction, the 

 preceding results wiU be changed into the following : 



Temperature. Salt dissolved in 100 water. 



15-64° 43-50 



49-31 55-63 



74-89 65-51 



105-48 77-89 



These results are represented by a curve deviating very little 

 from a straight hne. They are represented on the plate. 



SuhihUiti/ of Chloride of Sodium. 



Temperature, Salt dissolved in 100 water. 



13-89° 35-81 



16-90 35-88 



69-93 37-14 



109-73 40-38 



The line of solubihty of this chloride is not a straight line ; for 

 the equation of a line passing by the two extreme ordinates, 

 35-81 and 40-38, is j/ = 0-04768 .r° + 35-15, and the solubihty 

 calculated from this equation for the temperature 59-93° is 38-01 

 instead of 37-14, which experiment gives. At the temperature 

 of 0°, I found a solubility a httle greater than at 13-89°, and I 

 intend to make new experiments to investigate this anomaly. 



SoluhiUty of Sulphate of Potash. 

 Temperature. Salt dissolved in 100 water. 



12-72° 10-57 



49-08 16-91 



63-90 19-29 



101-50 26-33 



The line of solubility is a straight hne whose equation is 

 y = 0-1741 x° + 8-36 



Solubilitj/ of Sulphate of Magnesia. 



Temperature. Salt dissolved in 100 water. 



14-58° 32-76 



39-86 45-05 



49-08 49-18 



64-35 • ". 56-75 



97-03 - 72-30 



The line of solubility is a straight line whose equation is 



1/ - 0-47816 x° + 25-76 

 The sulphate of magnesia is here supposed anhydrous ; but as 



