74 



FLUORESCENCE OF THE URANYL SALTS. 



(1) Most of them at +20, as may be seen from the diagram and 

 from table 25, in which they are listed together with the corresponding 

 fluorescence, are reversals of fluorescence. These do not form a con- 

 tinuation of the absorption series lying farther toward the violet, nor 

 can they be grouped in series having the absorption interval of 71 ^ 

 In all four species every fluorescence band of groups 5 and 6 has its 



TABLE 25. New absorption bands at +#0 C. 



corresponding absorption band, and this relation extends to some of 

 the bands of group 4. Indeed, the suspicion would seem warranted 

 that were the proper experimental conditions attainable throughout 

 the spectrum, every fluorescence band would be found to have its 

 related absorption band and to be reversible in the sense in which that 

 term is defined in a subsequent paragraph. 



