AQUEOUS SOLUTIONS.—-ARCHIBALD. 301 
mixture can be taken to be exactly the same as the value found 
by observations on the simple solutions only in the case of 
infinitely dilute mixtures. 
The fact that for mixtures of nearly saturated solutions of 
these salts, the difference between the caleulated and observed 
values is only 1.47 per cent, while for solutions of KCl and NaCl 
as near saturation, the difference is about 5 per cent, as deter- 
mined by MacGregor* and again by MeIntosh*, would seem to 
indicate that in the case of this class of salts, the magnitude of 
the differences depends on the amount of salt in the solution, 
not on the nearness to saturation. 
It would appear from the above results that for mixtures of 
solutions of these salts not more concentrated than 0.8 equiva- 
lent gramme-molecules per litre, it is possible, by the aid of the 
dissociation theory, to calculate the conductivity within, or but 
little beyond, the limit of the error of observation. 
IZOC. Cite 
