BY MEANS OF THE RADIOMICROMETER. 



25 



the case of magnesium nitrate, the work having been three times 

 repeated and the same results obtained in every case. We desire to 

 arrest attention to this apparent peculiarity of the hydrated nitrates. 

 The 1.25/i band (fig. 10) does not show this peculiarity. The results 

 here are of the same general character as in the cases of the other 

 hydrated salts with which we worked. There are differences as great as 

 25 per cent between the absorption of the solution and that of the sol- 



90 



70 



60 



50 



- 

 c 

 '53 



to 



03 



& 40 



03 



"c 



S 30 



20 



10 



MgClj,4.49N 

 Depth 20mm. 



0.9 



0.95 



1.0 



1.05 1.10 



FIG. 1. Wave-lengths. 



1.15 



1.20 



80 



70 



60 



o 

 1 50 



S 40 



o 



M 



cS 



30 



20 



10 



MgCI 2 ,4.49N 

 Depth 10 mm. 



1.1 



1.15 



1.20 1.25 1.30 



FIG. 2. Wave-lengths. 



1.35 



1.40 



