198 



FLUORESCENCE OF THE URANYL SALTS. 



proved to be the case when the temperature was raised from 180 

 to 60, but on further heating to 30 the 60 spectrum failed to 

 change over to the very broad banded form. Finally, the temperature 

 was raised to 18, the cryohydrate point. The original spectrum of 

 the unfrozen solution then reappeared. 



-60 



IN WATER. 



-90 



-120 



7IV 



-ISO" 



/T\ 



A 





/TV 



A 



leloo 



ifloo 



zoloo 



.60U 



FIG. 99. 



The slow cooling of the 1/10 normal solution produced a series of 

 spectra similar to the above, but dimmer and not quite as well defined. 

 (See fig. 98.) The 1/100 normal, although too dim to be measured 



NITRATE IN NITRIC ACID. -180 



20: 1 



A A A I I A y A A A A A I yTV IA 



10: 1 



A A /\ A A 



I a A 



2:1 



J\A 



A A A AA\ \/\ A 



1:2 



I, 



A I A 



yi\ ^i\ yrv 



C2.75 



yr\ 



/TV 



A 



ino 



1:75 



1:5 



1:1000 



isloo 



20100 



FIG. 100. 



