BY MEANS OF THE RADIOMICROMETER. 



33 



90 



DISCUSSION OF THE RESULTS. 



The chief points of interest brought out by a study of the transmis- 

 sion curves for hydrated and for non-hydrated salts are the following: 

 Aqueous solutions of hydrated salts generally have greater transpar- 

 ency than pure water at the centers of the absorption bands. The 

 exceptions are the lju band for zinc nitrate (fig. 9) and magnesium 



70 



60 



50 



a 



03 



4 



a 



<u 



2 

 I 



30 



20 



10 



Zn(N0 3 ) 2 .4.30N 

 Depth 20mm. 



0.9 



0.95 



1.0 1.05 1.10 



FIG. 9. Wave-lengths. 



1.15 



1.20 



90 



\ 



70 



o 60 



03 



M 



H,0 







o 



I 



30 



20 



10 



Zn(N0 3 ) z .4.30N 

 Depth 10mm. 



1.1 



1.15 



1.20 1.25 1.30 



FIG. 10. Wave-lengths. 



1.35 



1.40 



