582 



Mr. H. D. Murray on the 



where K is a constant. Suppose that in the precipitation of 

 sulphur, we have univalent, divalent, and trivalent cations 



&g. 2. 



1 



c 



Ba 



Sr 





■i 







1 



© 



Zr 



Ca 



'M 



3" 





K" 

 Na* 

























Ll 





2-0 



1-5 



Log N 



1-0 



30 



20 



1-0 



Log C 



whose atomic numbers, or rather, the values of N w , are 

 approximately equal, then we may write, 



d :C 2 :C 3 = 5-9N- 1,64 : 1-46 N* 1 " 64 



= 5-9 

 = 17-7 



= (4-2) 2 



1-46 



4-4 



4-4 



0-33 N 

 0-33 

 1 

 1, 



-1-64 



a result in accordance with Whetham's law. It seems 

 probable, therefore, that the latter is only applicable to ions 



