o 



12 SCIENCE PROGRESS. 



of solvents in loosening the connection between two ions, i.e., 

 their relative ionisation powers, will be proportional to their 

 dielectric constants. 



As well as loosening the connection between the two 

 spheres, the conducting body will attract each sphere to it- 

 self. There will be, therefore, chemical forces between the 

 free ions and the mass of the solvent. These forces will, 

 however, be, in general, equal in all directions, so that 

 mobility is secured, the ions being passed on, under the 

 influence of the external electromotive force, from one portion 

 of solvent to another. 



Readers who wish to examine the subject more in detail 

 may be referred to a book on Solution and Electrolysis by the 

 present writer, and, for further developments of the dissocia- 

 tion theory, to Ostwald's Lehrbuch der Allgemeinen Chemie, 

 and to Nernst's Theoretische Chemie. Useful summaries 

 will also be found in Watts' Dictionary of Chemistry. 



Cecil Dampier Whetham. 



