URANIUM SALTS. 



127 



strip showing the effect of adding water; the amount of water added being 

 very small for the first few strips. 



For strip 1 the absorption consists largely of the bands a, X 5000 (very 

 broad and probably double), b, X 4840; c, /46S0; d, X 4530, ,14440 (latter 

 component very strong); e, >1 4310; /, yl 4170; and g, ,14050. 



The addition of water causes the absorption in the region X 6250 to 

 increase. There are also broad absorption bands at X 5000 and X 5250, 

 which are very diffuse and are somewhat stronger for the aqueous solution. 

 The 6 glycerol band disappears entirely. The c glycerol band breaks up 

 into two, and as the amount of water increases one of these moves rapidly 

 towards the violet. The stronger component remains practically station- 

 ary. In strip 7 their wave-lengths are X 4565 (weak) and X 4690 (strong and 

 about 30 Angstrom units wide). The faint component of d disappears 

 and there is left a very diffuse band at about X 4420. The e band is double 

 with components at X 4250 and X 4290. About these components there is a 

 very considerable amount of general absorption. The / band is at X 4150. 



Uranous Chloride in Mixtures op Glycerol and Methyl Alcohol, Glycerol and 

 Ethyl Alcohol, and Glycerol and Acetone. 



The addition of methyl and ethyl alcohols causes very little change in 

 the bands. Any large addition of acetone causes a precipitate to be formed. 



Uranods Chloride in Acetone, in Methyl Alcohol, and in Glycerol. 



Plate 95, A, represents the absorption spectra of a solution of uranous 

 chloride in acetone, the depth of cell being 1.2, 2, 3, 5, 8, and 11.5 mm. The 

 slit was 0.10 mm. in width, current in Nernst glower 0.94 ampere, exposure 

 1.5 minutes to glower and 3 minutes to the spark. The bands are faint and 

 diffuse. By the addition of hydrochloric acid they are made very much 

 stronger, although the wave-length of the bands is not changed. 



Plate 95, B, represents the absorption spectra of uranous chloride in 

 methyl alcohol; the depths of cell being 2, 4, 6, 8, and 12 mm. These solu- 

 tions had been made about six months before being used. Bands appear 

 at X 6650, X 6200, X 5600, X 5250, X 4900 to X 5070, X 4780, X 4665, X 4600, 

 X 4230, and X 4110. The absorption is very strong throughout the region 

 X 4200, and is so general that there is hardly any banded appearance. 



Plate 95, C, represents the absorption of a solution of uranous chloride 

 in glycerol (the glycerol also contained strontium chloride). The depths 

 of cell were 2, 4, 6, 8, 12, and 24 mm. The absorption spectra show the 



