214 JONES-STRONG— THE ABSORPTION SPECTRA [April 24, 



(h) Absorption of Uranyl Chloride in Ethyl Alcohol. 



The absorption spectrum of uranyl .chloride in the ethyl alcohol 

 shows the uranyl bands quite strongly, although they are less intense 

 than for the methyl alcohol solution. A very interesting resemblance 

 has been found for the various uranyl bands of different mixtures. 

 The absorption spectrum of a solution of uranyl chloride in ethyl 

 alcohol has been found to be almost the same as that of a methyl 

 alcohol solution of uranyl chloride containing a 0.9 normal concen- 

 tration of calcium chloride or an aqueous solution of uranyl chloride 

 and a 2 normal concentration of aluminium chloride. 



The positions of the uranyl bands for the ethyl alcohol solution 

 was approximately: 



abcdefghi 

 X 4900 4750 4580 4400 4400 4250 4100 3980 3860 



The relation above mentioned comes out much better in comparing 

 the spectrograms. The values of wave-lengths thus far given does 

 not bring this out very well on account of the difficulty of making 

 measurements. Much more work is to be carried on along this line, 

 and the measurements above given are to be considered as more or 

 less of a preliminary character. 



(i) The Blue-Violet Band. 

 Under the various changes above noted, i. e., of changing the 

 acid radicle, of changing the solvent and of adding foreign sub- 

 stances, the position at which the blue-violet band faded away was 

 approximately A 4200. This is rather unexpected when we con- 

 sider the very considerable effects which are produced upon the 

 finer bands. 



VII. Absorption Spectrum of Uranous Salts in Solution. 



It is quite well known that by reduction the yellow uranyl 

 salts are changed to the intensely green uranous salts. In the 

 present work this reduction was accomplished by adding the same 

 acid to the solution that corresponded to the anion of the salt and 

 then putting in a metal that would produce a colorless salt. 



The absorption spectrum of uranous sulphate and uranous 



