556 
Proceedings of the Boyal Society of Edinburgh. [Sess. 
obtained with a solution two months old. The bands at A = ‘292 /j. and at 
\ = -355 jU have disappeared. 
Owing to the strengths of the solutions employed the regularities obtained 
cannot be attributed to the “ colour of the ions:” This hypothesis has now 
lost its meaning owing to the new conception of the atom introduced by 
