228 Proceedings of the Koyal Society of Edinburgh. [Sess. 
It may be observed that the curvature of the graphs becomes less and 
less as we pass from pure water towards those waters which are richest 
in chloride. This suggests that for a highly concentrated sea- water the 
graph would approximate to a straight line ; that is to say, the term j3 in 
the expression for the temperature coefficient would become an almost 
negligible quantity. 
In conclusion, we would draw attention to an interesting connection 
which appears to exist between the total chloride present and the tempera- 
ture coefficient of the solution. 
In fig. 4 the different chlorine values are taken as ordinates and 
plotted against the first term a of the temperature coefficients as abscissae ; 
the resultant curve indicates that equal increments in the total chloride 
produce certain other equal increments in the magnitude of a. The author 
hopes that he may be able to investigate this relationship more fully in 
the near future. 
