﻿73G Prof. H. C Jones on Absorption Spectra 



was photographed, also when water was added to the glycerol 

 solution. 



The absorption spectrum in glycerol was found to be very 

 different from what it was in water. 



The absorption spectrum of uranous chloride in a mixture 

 of methyl alcohol and ether was photographed. The methyl 

 alcohol solution showed complete ultra-violet absorption to 

 wave-length X3700. The addition of ether increased the 

 absorption, the absorption of the short wave-lengths extending 

 now to X 3800. 



In methyl alcohol there was considerable general absorption 

 in the region \4300. With the addition of ether the ab- 

 sorption was almost complete from X4100 to A. 4450. The 

 addition of ether caused the uranyl bands to shift slightly 

 towards the red without, however, changing their general 

 character. The magnitude of this shift can be seen from the 

 following table. 



Uranyl chloride bands in methyl alcohol, 



XX 3880, 4000, 4110, 4240, 4400, 4610, 4780, 4930, 5050, 

 4135, 4285. 



Uranyl chloride in methyl alcohol to wliich ether is added. 

 XX 3890, 4010, 4140, 4260, 4440, 4630, 4790, 4960, 5050. 



The effect of the presence of ether is thus very pronounced, 

 not only causing the bands to shift slightly towards the red, 

 but also increasing the amount of absorption. 



It should be stated that in the work with the uranous salts, 

 there were present in the solution in addition to the salt a little 

 of the free acid of the salt and a small amount of the zinc salt. 

 While these probably had a slight effect on the absorption 

 spectra, the effect must have been far too small to have pro- 

 duced such changes as those recorded above for the different 

 solvents. 



Having found such abundant evidence for the effect of the 

 solvent on the power of the dissolved substance to absorb 

 light, in the case of the few solvents referred to above, it 

 seemed very desirable to bring other solvents within the scope 

 of this work, and this has been done. SiiK?e the neodymium 

 lines and bands are very sharp, it was selected as the principal 

 substance to be used in studying the effect of the solvent on 

 the absorption spectra of the dissolved substance, where a 

 large number of solvents was to be emploved. This phase 

 of the work has been very recently carried out by Jones and 

 Strong. 



