OF DILUTE SOLUTIONS OF ELECTROLYTES.—HEBB. 431 
In these results I have not continued my determinations to 
as concentrated solutions as I would have liked, but I was 
unable to do so on account of lack of cold weather. On the 
other hand, it would be useless for me to attempt to deal with 
diluter solutions than I have used, for my possible error is too 
great. 
The values of the depression constant seem to oscillate about 
the value 1.85 and if the mean be taken we get 1.849. This is 
the value arrived at by two methods suggested by Dr. MacGregor. 
The one he applied* and the other I applied+ to a considerable 
number of data. 
If from the above table we plot concentrations as ordinates 
against equivalent depressions as abscissae, we get points which, 
though they do not lie on a smooth curve, can be represented by 
drawing a smooth curve through them in such a manner that as 
many points fall on one side of it as on the other. If we draw 
in this curve we find that it is convex towards the concentration 
axis. Further, if we plot alongside of it similar concentration- 
equivalent depression curves for other observers, we find that 
in all cases their curves lie nearer the concentration axis than 
mine, although no two of them pursue exactly the same course. 
That the values of my depressions are greater than those of 
other observers might be expected, for I am not aware that any 
of them worked with their air temperature at zero. Also the 
fact, that the values of the depression constant, as obtained from 
my results, agree so well with what is expected, would lead one 
to suppose that my values of the equivalent depressions are not 
too great. 
The following table will give some idea as to how Loomis’,t 
Jones’,t and my concentration-equivalent depression curves lie, 
I have roughly drawn smooth curves through each observer's 
results, and then read off the results for the different concen- 
trations. 
* Proc. and Trans. N.S. Inst. Sci., Vol. X., p. 211, 1899-00. 
+ Proc. and Trans. N. S. Inst. Sci., Vol. X., p» 409, 1901-02. 
t Not having access to their papers, I have taken the data from a paper by Prof. 
MacGregor : Proc. and Trans. N.S. Inst. Sci., Vol. X., p. 211, 1899-90. 
