48 
Proceedings of the Koyal Society of Edinburgh. [Sess. 
of the maximum of the band could not be determined for aqueous solutions 
of high concentration. In fig. 2 curves are given showing the absorption 
of aqueous solutions I., II., III., of concentrations c — 40, c = POO, c — 4*00 
respectively, and of one alcoholic solution, IV., of concentration c — ' 026. 
Prom these curves it may be inferred that the nickel chloride in solution 
undergoes a steady continuous change as we pass from dilute aqueous 
solutions through saturated aqueous solutions to alcoholic solutions. This 
phenomenon bears a great resemblance to that observed in solutions of 
cobalt chloride and discussed in the sixth article of this series, and it is 
probably to be ascribed to the same cause, viz. the change of the chloride in 
solution from a more to a less hydrated phase. 
(. Issued separately February 13, 1913.) 
