put in a vessel of Jena glass, wliicli liad been placed in a nitrate 

 bath of ± 360°. The nitrate batli was then allowed to cool very 

 slowly, in which the range of temperature between 370° — 340° 

 was passed through in about 3 hours; the further cooling pi'oceeded 

 more rapidly. The obtained solid substance was then ground to 

 powder, and then shaken in a thermostat with a little water at 25° 

 for 2 hours, after which in the usual way a certain quantity of 

 saturated solution was twice pipetted off. 



We determined of each quantity obtained in this way : 



1. the total weight. 



2. the weight of the sum NaCl + KCl (by careful evaporation, 

 followed by heating to the temperature of melting). 



3. the weight of KCl (according to Schlösing-Wense's method). 

 At the same time for a comparison the solubility of the same 



mixtures a and b was determined at the same temperature, but when 

 they had not been heated previously. 



The weight of the NaCl has been calculated from the difference in weight between 

 KCl + NaCl and KCl; the weight of the water has been calculated from the total 

 weight of the solution, diminished by the weight of the NaCl i KCl. 



