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II. —Ionic Velocities. 
By Orme Masson, M.A., D.Sc., Professor of Chemistry in the University of 
Melbourne. 
Communicated by Professor W. Ramsay, F.R.S. 
Receh'ed December 12,—Read December 16, 1898. 
Introduction. 
The general theory of electrolytic conduction, involving the laws of Faraday, 
Hittorf, Kohlrausch, and Arrhenius, may be briefly summed up by the formula 
C = A — (U + V) = A — Tra: (m + v\ 
7] V 
where 
C is the current, 
A is the area of cross-section of the conducting medium, 
7} is the electro-chemical equivalent of hydrogen or l/y is the charge per 
monad ion, 
n is the number of monad equivalents of the electrolyte per unit volume of 
solution, 
U is the average working velocity of the cations, 
V is that of the anions, 
TT is the fall of potential per unit of length (dV/dl), called in the sequel 
potential slojie, 
X is the coefficient of ionization, 
u is the velocity with which the same cations would travel if, all other 
things being equal, ionization were complete, and the potential slope 
had unit value, and 
V is the corresponding value for the anions. 
u and V are referred to in the sequel as specific velocities. 
In further explanation it may be pointed out that x may be taken as representing 
either that fraction of the total dissolved molecules which is at any given moment in 
2 u 2 20.4.99 
