POTASH MANUKES 



283 



haps, the best adapted for the purpose, but it is one of the 

 most plentiful, and therefore the cheapest of the potash 



AVERAGE COMPOSITION OF GERMAN POTASH SALTS. 



salts. It is obvious that the purer and more concen- 

 trated products prepared from it cannot be sold at the 

 same rate, per unit of potash, as the crude mineral. 

 The manurial value of kainite and of the other potash 



