48 



Studies on Solution. 



Ac curves for wave-lengths beyond 978juju, on the edge of the infra- 

 red absorption band, show that A is a constant for all values of c. 



The shift of the red band may also be seen from an inspection of the 

 absorption curves. This is seen, not by looking at the summit of the 

 band, which remains unchanged in position of the minimum of absorp- 

 tion, which is situated at 920//ju for c greater than 2.5, and at 881^ 

 for c less than 2.5. 



TABLE 18. Nickel Chloride in Water (Figs. 16 and 17). 



