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 appliedf 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 Loorais',J 

 Jones',! an ^ ray 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. 

 t 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, 189COO. 



