1905 - 6 .] Prof. Gibson on Aqueous Solutions of Electrolytes. 237 
within the range of concentration for which the linear relationship 
holds. 
It is important to notice that as y = 2L and = \s, the adoption 
of unit of mass instead of unit volume does not affect the 
numerical statement of the relationships which have been established 
for dilute solutions; for when s=l, as is practically the case in 
dilute solutions, y coincides with rj and with A. To prevent 
confusion, the old units, viz., rj, m, A will be referred to as volume 
units ; and the new units, y, T, and A^, as mass units. 
(Issued separately August 29 , 1906 .) 
