580 



Mr. H. D. Murray on the 



and aluminium are typical divalent and trivalent ions, we 

 obtain the equations 



C 3 = -33 N" 1 * 64 , 



where C 2 and C 3 are the minimal concentrations of divalent 

 and trivalent ions respectively. We shall return to these 



Fiff. 1, 



•Ba ^ 



Cs 



\Rb" 







2-0 





• 

 Cif 











ro 





• Ca" 





•K" \ 







Log N 





•ALT 







\»Na 















\ 





l"U 













Li"* 





V 



2-0 



1-0 

 Log C 



0-8 



results later. The concentrations of cations with N0 3 ' anions 

 are given in some cases to show that they follow approximately 

 the same rule. 



