4© McBAIN [1898 Kummell 



parently the incorrect method of calculation based on constant 

 volume of solution was used. 



(ii) By means of Helmholtz's formulae, from the E.M.F. of 

 concentration cells. 



i8g8. D. Mcintosh. 



The Transference Number of Hydrogen. Jour. Phys. Chem., 2, 273. 



The transference number was obtained from the ratio of the 

 E.M.F.'s of concentration cells with and without diffusion, 

 making use of the formulae of Helmholtz. 



(i) Electrodes of hydrogen (platinised platinum), and mercury 

 plus mercurous salt. 



(ii) Electrodes of hydrogen and chlorine (platinised platinum). 



HCl i.o-o.i m lex .126 



i.o-o.oi lex .297 



o.i-o.oi lex .404 



i8g8. 0. Masaon. 



Ueber lonengeschwindigkeiten. Zeit. phys. Chem., 2g, 501. Phil. Trans., 

 1899, /g2, 331. 



Apparatus : two electrode chambers (flasks) connected by a 

 narrow tube containing the gelatinized solution to be measured. 

 *' Indicators " were placed in the flasks (cupric sulphate or chlor- 

 ide at the anode, and potassium chromate at the cathode), and 



