MIXTURES OF ELECTROLYTES—MACGREGOR. 119 
according to assumption (1) the conductivity would be greater 
than Bender's reduced value by 1.6 per cent. and that according 
to assumption (2) it would be greater by 1.3 per cent. Similar 
calculations could not be carried out with solutions stronger 
than No. 18, owing to lack of data. If the above assumptions 
be regarded as representing even roughly the effect of mixing on 
the ionic velocities, the calculations based on them shew that 
the error introduced by neglecting the effect of mixing would be 
of the same sign and order of magnitude as the differences 
between the calculated and observed values of the above table. 
While, therefore, such calculations are of little value, they 
strengthen the suspicion that the discrepancies of the above 
table are due to the impossibility of taking into account the 
effect of mixing on the velocities of the ions. 
