1902-3.] Freezing-Point Depression in Electrolytic Solutions. 379 
Potassium Chloride. 
Depression. 
0*1841 
0*1839 
Concentration. 
0*0527 
0*05275 
Equiv. 
Depression. 
3*494 
3-486 
Equiv. Depr. 
for N/20. 
3-497 
3*489 
0*1829 
Sodium Chloride. 
0-0519 3-524 
Mean, 3*493 
3*526 
Taking the results of Loomis and Barnes from the tables com- 
piled by MacGregor ( Trans . Nova Scotia Institute of Science , 
1899-1900, pp. 218-220), we obtain the following comparison for 
equivalent depressions in 0*05 normal solution : — 
Loomis 
Barnes 
Walker and Robertson . 
Hydrochloric Potassium Sodium 
Acid. Chloride. Chloride. 
3-59 3-50 3-531 
3*597 3-504 3-536 
3-590 3-493 3*526 
The divergence of our results from the mean of those of Loomis 
and Barnes is for hydrochloric acid 0T per cent., for potassium 
chloride 0*25 per cent., and for sodium chloride 0*2 per cent. In 
each case our result is the smaller. This may be due to a differ- 
ence in the degree value of the thermometers employed by the 
different observers — our own is uncertain to 0*4 per cent. — or it 
might be due to the difference of the systematic error of the methods 
employed by Barnes and Loomis on the one hand and ourselves 
on the other. Whatever be the cause of the slight difference, 
the agreement as it stands is of a very satisfactory nature, and 
tends to increase confidence in the results of exact cryoscopy. 
{Issued separately January 28, 1903.) 
