560 



So when we shake these inixtiires at 25° with such a quantity 

 of water that the two solid phases continue to exist side by side, 

 in both cases, the coexisting solution will lie in Q, or in other words 

 the coexisting solution will always possess the same concentration 

 independent of the concentration of the phases. 



If on the other hand we had to do with the appearance of a 

 compound V (see Fig. 3), we sliould, working in the same way, 



cxa 



Fig. 3. 



stai'ting from the mixture a, obtain the coexistence of solid KCl -j- 

 solid compound V -\- solution Q. Starting from b on the other hand 

 we should get solid compound V -\- solid NaCl -j- solution R. So in 

 this case the coexisting solution would not be the same for the two 

 experiments. 



3. The just-mentioned circumstances may, therefore, supply an 

 exceedingly simple method to solve the pending question. 



Two mixtures a and b of the substances which had been previously 

 pui-ified, were melted in a platinum crucible, after which they were 



