126 A STUDY OF THE ABSORPTION SPECTRA. 



1.5 minutes to the whole spectrum, 2 minutes to the ultra-violet of the 

 Nernst glower, and 1 minute to the spark. 



The absorption for the two solvents is very much the same; the bands 

 being much alike in intensity and position. The methyl alcohol bands 

 are of slightly shorter wave-length. 



Ethyl alcohol solution: A4290 (narrow), X 4710, A 4950 to A 5050, 

 X 5280 (weak), and X 6200 to X 6300. 



Methyl alcohol solution: X 4000, X 4130, X 4250, X 4290 (narrow), 

 X 4700, X 5020, X 5260, and X 6150 to X 6300. 



A solution of the uranous chloride in methyl alcohol stood for almost 

 a year. The absorption of this solution was quite different from that 

 described above. This was probably due to the much larger amount of 

 hydrochloric acid and zinc chloride in the old solution; as small amounts of 

 hydrochloric acid as possible having been used in the solution described 

 above. The position of the bands of the "old" solution were: X 3910 

 (double), X 4020 (double), X 4130 (double), A 4590, A 4750, X 4710, X 5000, 

 X 5550, and X 6500 to X 6800. 



Uranous Chloride in Glycerol. 



In making a glycerol solution of uranous chloride a strong solution 

 of uranous chloride is made in some other solvent. It is then mixed with 

 glycerol and warmed. The warming is continued until as much of the other 

 solvent is evaporated as possible. Spectrograms are then made of different 

 depths of this solution, and of mixtures of glycerol with some other solvent. 

 Plate 87, C, represents the absorption spectra of a glycerol solution of 

 uranous chloride of different depths; starting with the lowest strip the 

 depths being 3, 4, 6, 9, 12, 18, and 24 mm. As the reduction was not com- 

 plete it is impossible to know the concentration of the uranous chloride, 

 although this could be found approximately. The spectrogram shows 

 the uranyl bands and the uranyl blue-violet band. Knowing the depth 

 of layer and having made the spectrogram it is possible to know quite 

 accurately the amount of uranyl chloride in the solution. The remainder 

 of the uranium chloride is probably in the uranous condition. 



The uranyl bands, i, X 3800, h, X 3930, and g, X 4050, are very weak and 

 about 60 Angstrom units broad. The band/, X 4170, is fairly strong, as is 

 also e, X 4310; d is double, consisting of a wide diffuse band at X 4440 and a 

 narrower diffuse band at X 4530; c, X 4680, and b, X 4840, are both very 

 strong, and about 80 Angstrom units wide; a, X 4980, is very narrow and 

 has a very weak band at about X 5060. The weak band at X 5060 is barely 

 visible in the original negative. For the greater depths of cell, bands 

 several hundred Angstrom units wide and extremely diffuse appear at 

 about X 5300, X 5600, and X 6300. These will be more fully discussed when 

 uranous chloride in mixtures of glycerol and other solvents is described. 



Uranous Chloride in Mixtures of Glycerol and Water. 



Spectrogram, Plate 86, A, represents the absorption of a solution of 

 uranous chloride in glycerol to which water is added. Strip 1 represents 

 the absorption of a 6 mm. solution of uranous chloride in glycerol; the other 



