FLUORESCENCE AND ABSORPTION OF THE URANYL SALTS. 37 



In a concentrated solution of potassium uranyl sulphate (see fig. 26) 

 three absorption bands were found at 4,910, 4,730, and 4,570. These 



FIG. 25. Uranyl sulphate (solution), show- 

 ing at the left a portion of the trans- 

 mission spectrum for a thin layer and at 

 the right for a thick layer. 



.50 



FIG. 26. Transmission of a concentrated 

 solution of uranyl potassium sulphate. 



do not agree in position with the corresponding bands of the solid salt, 

 which occur at 4,920, 4,760, and 4,472. The solution of the double 

 sulphate shows no trace of fluorescence. 



