WORK OF J. N. PEARCE. 



79 



the inverse volume relations, we should expect the migration velocity of sodium to be 

 less than that of potassium. This has been found to be the case. 



The atomic volume of sodium is also slightly less than that of calcium, and con- 

 siderably less than those of strontium and barium; yet, owing to the greater hydra- 

 tion of the cations of the calcium group, its migration velocity is greater. 



For the curves representing the values of H and M, see figs. 30 and 31. 



30- 



S 20 



10- 



0.1 0.25 0.5 0.75 



Concentration 

 Fig. 31. 



Table 60. Sodium Bromide Data for Freezing-point and Conductivity Measurements, 



Specific Gravity, and Hydrates. 



'Amer. Chem. Journ., 34, 375 (1905). 



