THEORY OF DEPOSITION OF POTASH SALTS 



507 



acid which are stored are mostly insoluble or difficultly soluble 

 in water. On the other hand, the nitrates which are deposited are 





Fig. 43. Geological Relations of the Potash Deposits near Stassfurt. 



very soluble in water and this is true, though to a less extent, 

 with potash compounds. Nevertheless, all of these potash depos- 



