8 



FLUORESCENCE OF THE URANYL SALTS. 



The authors note specifically the following further important char- 

 acteristics of the spectra of the uranyl salts: 



(1) The steeper gradation of light on the side toward the violet in the 



case of bands showing a single crest. 



(2) The weakness of the outer bands, both toward red and violet, com- 



pared with the central bands of the spectrum. 



(3) The overlap of fluorescence and absorption. 



(4) The systematic shift of bands when a salt is dissolved in water and 



other solvents. 



(5) The remarkable changes due to the dehydration of salts containing 



water of crystallization. 



(6) The effects of heating. 



5678 



1.0 , 1,1 . 1.2 . 1.3 . 14 , 1,5 1.6 



1.0 , 1,1 1.2 , 13 . 14 , 15 , 16 



12 , 1,3 14 , 1,5 , 16 



10 , 1,1 , 12 , 1,3 . 14 , 1,5 1.6 



1.0 , 11 , 1,2 , 1.3 . 14 , 15 1,6 



10 1.1 12 , 1.3 . 14 , 15 1,6 



1,0 , 1,1 , 1.2 . 13 , 14 , 1,5 , 16 



1,0 , 1.1 , 12 . 13 14 , 15 1,6 



456 



10 1.1 12 . 13 , 14 1.5 1.6 



Fio. 1. 1. Uranic nitrate. 2. Uranic acetate. 3. Sodio-uranic acetate. 4. Uranic oxychlo- 

 ride (acid), mixed hydrates. 5. Potassio-uranic oxychloride. 6. Uranic oxyfluoride. 7. Bario- 

 uranic oxyfluoride. 8. Uranic phosphate, mixed hydrates. 9. Calcio-uranic phosphate. 

 10. Ammonio-uranic sulphate. 



