332 THE EARL OF BERKELEY, MESSRS. E. G. J. HARTLEY AND J. STEPHENSON 



which the value of the equivalent conductivity at that dilution (= p.J) lies ; that is, 

 between 0'074 and 0'09. 



Results for Strontium Ferrocyanide. 



These results are given in Table VIII. The first five lines refer to the stronger 

 solutions ; they practically cover the range over which the osmotic pressures were 

 measured, and thus, in conjunction with the equivalent conductivity at infinite 

 dilution, afford an insight into the relative dissociation of the salt. The last six lines 

 refer to the very dilute solutions. 



TABLE VIII. 



The numbers are plotted in diagrams 1 and 2 in the same way as in the case of the 

 calcium salt. 



From the curve of the very dilute solutions the value at infinite dilution will be 

 seen to lie between 0'076 and 0'098. 



Theoretical Considerations. 



From the foregoing conductivity results it will be seen that both the calcium and the 

 strontium solutions are fair conductors of electricity, yet if we judge from the osmotic- 

 pressure experiments alone, the calcium salt should show no appreciable dissociation, 

 while the strontium salt shows that there must even be some association. 



A tentative explanation of these facts may be based on either of two hypotheses : 



