BY MEANS OF THE RADIOMICROMETER. 



31 



The curve for the 1.25/j, band (fig. 16) brings out exactly the same 

 relations as have been noted for the l/j, band. These curves cross in 

 two places, as would be expected; first, in the region already men- 

 tioned for the lju band; second, for a small region around 1.3ju. For 

 all other wave-lengths the solution is less transparent than the solvent. 

 Sodium nitrate gave results of a slightly different character from 

 any that had been obtained for non-hydrated salts. The measure- 

 ments were repeated three times, two series of results being recorded. 

 In ever}^ case new solutions were used, yet results of the same general 



Zn S0 4 .2.92N 

 Depth 20mm 



80 



0.95 



1.0 



1.05 1.10 



FIG. 7. Wave-lengths. 



1.15 



1.20 



70 



60 



G 



.2 



' 



.2 50 



m 



c3 



h 40 



a so 



<D 



20 



10 



ZnS0 4 ,2.92N 

 Depth 10mm. 



1.1 



1.15 



1.20 1.25 1.30 



FIG. 8. Wave-lengths. 



1.35 



1.40 



