c 



o 



460 

 440 

 420 

 400 

 380 

 360 

 340 

 320 

 300 

 280 

 260 

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 20 



J:!. _rL jML jl_ jl_ j:l j;^ ji_ rL 



4000 2000 1000 500 250 125 62 31 15 



Concentration of alkali added 



Fig. 9. Showing the same depressing effect of the addition of alkali to m/256 



Na4Fe(CN)6. 



285 



