ELECTIVE ATTRACTION. 



Carbonat of Magnesia 



Muriat of ammonia 



Nitre 



XXXIX. 



Solution 

 ofoxideof^ 

 tungsten 

 ia potash 



"Potash 



Potash 1 



Nitric ^ 

 acid 



(Nitric 

 Oxide of f acid 



Nitric 

 'acid 



U J 



Oxide of 'tungsten 



