54 



Studies on Solution. 



conditions we would perhaps not expect to find such changes as have 

 been observed above in the case of the nickel band. Possibly similar 

 examples of this same phenomenon may be found. 



A solution of NiCl 2 6NH 3 in water of unknown concentration was 

 measured, and its absorption curve also appears in figure 18. 



NICKEL NITRATE IN WATER. 



Twenty-four solutions were prepared, varying in concentration from 

 c = 4.2 to c = 0.05. As was the case in the aqueous nickel-chloride 

 solutions, the A c curves show that the values of A experience 

 changes, with c depending upon the wave-length. The changes in the 

 case of the nitrate, however, although similar in their general character, 

 are nowhere so marked as in the case of the chloride. Throughout the 

 region from 565/z/x to 724/^u, which includes the short wave-length side 



TABLE 21. Nickel Nitrate in Water (Figs. 19 and 20}. 



