DESCRIPTION OF PLATES. 



103 



B 



Plate 15. A. 



B. 



Plate 16. 



B. 



Plate 17. A. 



B. 



Plate 14. A. Uranyl Chloride in Isopropyl Alcohol. Concentration of the chloride, 

 0.005 normal. Depth of cell variable. 



Uranyl Chloride in Ethyl Acetate. Depths of cell, starting with lowest 

 strip, 12, 24, 24, 24, 24, 24, 24, and 24 mm. Concentrations, 0.075, 

 0.075, 0.01, 0.014, 0.02, 0.03, 0.045, and 0.06 normal. 



Strip 1 is the absorption of a solution 35 mm. deep of Uranyl Nitrate in 

 Methyl Ester. Strip 2 is the absorption of Erbium Chloride (35 mm.) 

 in Propyl Alcohol. The other strips represent the absorption of Uranyl 

 Chloride in Butyl Alcohol. 



Uranyl Chloride in Formamide. Depths of cell, 3, 15, 15, 15, 15, and 15 m. 

 Respective concentrations, 0.073, 0.073, 0.1, 0.147, 0.219, and 0.293 normal. 

 A. Uranyl Chloride in Water, to which increasing amounts of an aqueous solu- 

 tion of Calcium Nitrate are added. This spectrogram was made to deter- 

 mine whether the addition of calcium nitrate resulted in a gradual shift 

 of the uranyl bands. The original film shows that the A and B bands 

 decrease in intensity, and the decrease seems to be considerably greater 

 on the red side of the bands. 



Uranyl Nitrate in Nitric Acid, to which increasing amounts of a Concen- 

 trated aqueous solution of Aluminium Chloride are added. The first addi- 

 tion consisted of three drops, and shows a large shift of the uranyl bands 

 towards the red. A gradual shift towards the red is shown by the suc- 

 ceeding strips in the original film. 



Uranyl Nitrate in Nitric Acid to which increasing amounts of Hydrochlo- 

 ric Acid are added. 



Uranyl Nitrate in Water to which an aqueous solution of Aluminium 

 Chloride is added. This spectrogram shows very clearly the shift of the 

 uranyl bands towards the red. 



Uranous Chloride in Propyl Alcohol. The variable here is the depth of cell. 



Uranyl Chloride in Propyl Alcohol. Depths of cell, 3, 12, 24, 24, 24, 24. 

 and 24 mm. Respective concentrations, 0.025, 0.025, 0.033, 0.046, 0.06, 

 0.1, 0.15, and 0.2 normal. 



Uranous Chloride in Isobutyl Alcohol. 



Uranyl Chloride in Isobutyl Alcohol. Starting with strip 1 the depth of 



cell was 10 mm.; succeeding depths were 24 mm. The corresponding 



'concentrations were: 0.02, 0.027, 0.037, 0.053, 0.08, 0.12, and 0.16 normal. 



Uranous Chloride in Isobutyl Alcohol. When uranyl chloride in isobutyl 

 alcohol is reduced by the addition of zinc and a small amount of con- 

 centrated hydrochloric acid, the uranous chloride formed appears as dark 

 green, oily looking drops, which collected at the bottom of the solution. 

 The remainder of the solution dissolves only a very small portion of the 

 uranous chloride. 19 A represents the absorption of the dilute portion; 

 whereas this plate represents the absorption of very thin layers of the 

 concentrated solution of uranous chloride. 



Uranyl Chloride in Methyl Ester. Starting with strip 1 the depths of cell and 

 concentration were: 10 mm., 0.021; 24 mm., 0.028; 24 mm., 0.04; 24 mm., 

 0.057; 24 mm., 0.085; 24 mm., 0.13; and 24 mm., 0.17 normal. 

 Plate 21. A. Uranous Chloride in Propyl Alcohol. 



B. Uranyl Nitrate in Propyl Alcohol. Strip 1 has a depth of cell of 10 mm. 

 and the depth for the other strips is 24 mm. The concentrations were 

 0.08, 0.10, 0.15, 0.21, 0.32, 0.48, and 0.63 normal. 

 Plate 22. A. Uranyl Nitrate in Water to winch increasing amounts of Calcium Nitrate 

 were added. The addition of calcium chloride would cause the uranyl 

 bands to be shifted towards the red. If this is due to the presence of 

 calcium, then calcium nitrate should also cause the uranyl bands to 

 shift towards the red. This does not appear from the plate, the bands 

 being practically of the same wave-lengths after calcium nitrate had 

 been added. This spectrogram (the film at least) gives evidence that the 

 effective agent in causing the shifts of the uranyl bands is the acid radicle. 

 B. Uranous Chloride in Ether and Hydrochloric Acid to which Acetone is added. 



B. 



