DESCRIPTION OF PLATES. 



107 



Plate 42. A. Uranous Bromide in 7 parts Water and 12 parts Methyl Alcohol (strip 1) 

 to which are added 10 (strip 2), 20 (strip 3), 40 (strip 4), and 80 (strip 5) 

 drops of a concentrated solution of Calcium Nitrate in Water. This 

 spectrogram shows that in this case the water bands are intensified and 

 also changed in character, the two red water bands having their relative 

 intensities greatly changed. The percentages of water present, start- 

 ing with strip 1, were: 37, 43, 52, 64, and 75. 

 B. Uranous Chloride in Ether and Methyl Alcohol to which increasing amounts 

 of Hydrogen Peroxide were added. 

 Plate 43. A. Uranous Chloride in Water and Methyl Alcohol to which Hydrogen Per- 

 oxide is gradually added. This spectrogram shows the simultaneous 

 oxidization of the hydrate and alcoholate of uranous chloride. 

 B. Uranous Bromide in Water and Methyl Alcohol to which Potassium Chlo- 

 rate in Water and Methyl Alcohol was gradually added. 

 Plate 44. A. Uranous Chloride in Water and Acetone to which Hydrogen Peroxide is 

 gradually added. 

 B. Uranous Bromide in Glycerol to which Hydrogen Peroxide is gradually 

 added. 

 Plate 45. A. Uranous Bromide in Water and- Methyl Alcohol to which Nitric Acid is 

 added. 

 B. Uranous Chloride in Acetone and Methyl Alcohol to which Nitric Acid is 

 added. 

 Plate 46. A. Uranous Bromide in 7 parts Water and 12 parts Methyl Alcohol (strip 1) 

 to which is added Potassium Nitrate in 2 parts Water and 3 parts Methyl 

 Alcohol (strips 2 and 3), and corresponding strips (4, 5, and 6) where 

 Calcium Nitrate is added instead of Potassium Nitrate. This spectro- 

 gram shows the selective action of these salts on the water and alcohol 

 bands, the water bands having practically disappeared in strips 3 and 6. 

 B. Uranous Sulphate in Water to which Nitric Acid is added in increasing 

 amounts. 

 Plate 47. A. Uranous Bromide in 7 parts Water and 12 parts Methyl Alcohol to which 

 increasing amounts of Calcium Nitrate in Methyl Alcohol are added. 

 B. Uranous Bromide in 2 parts Water and 3 parts Methyl Alcohol to which 

 , increasing amounts of Sodium Perchlorate in Methyl Alcohol are added. 

 These strips of A and B show the selective action of the calcium nitrate 

 and sodium perchlorate on the water and alcohol bands, the water bands 

 practically disappearing. In this case part of the effect may be due to 

 the increased percentage of alcohol present. 

 Plate 48. A. Uranous Sulphate in Sulphuric Acid to which Nitric Acid is added. No 

 oxidization takes place. 

 B. Uranyl Bromide in Water to which Nitric Acid is added. Tbe two upper 

 strips represent the absorption of a solution of uranyl chloride to which 

 were added acetic acid and zinc, to find whether uranous acetate or 

 uranous chloride would be formed, and in what amounts. 

 Plate 49. A. Uranous Bromide in Water and Methyl Alcohol. 



B. The first three strips represent the oxidization of an aqueous solution of 

 Uranous Sulphate by Hydrogen Peroxide. The other four strips rep- 

 resent the oxidization of a Sulphuric Acid solution of Uranous Sulphate 

 by Hydrogen Peroxide 

 Plate 50. A. Cobalt Chloride in Methyl Alcohol. Concentration, 0.01 normal. Depth 

 of cell, 10 cm. Starting with the lowest strip the temperatures are: 30, 

 45, 55, 70, and 80. 

 B. Cobalt Bromide in Methyl Alcohol. Concentration, 0.01 normal. Depth 

 of cell. 10 cm. Starting with the lowest strip the temperatures are: 34, 

 44, 55, 66, 81, and 100. 

 Plate 51. A. Cobalt Bromide in Methyl Alcohol. Concentration, 0.1 normal. Depth 

 of cell, 1.0 cm. Starting with the lowest strip the temperatures are: 31, 

 46, 58, 64, 68, and 72. 

 B. Cobalt Chloride in Methyl Alcohol. Concentration, 0.1 normal. Depth 

 of cell, 1.0 cm. Starting with the lowest strip the temperatures are: 23, 

 37, 47, 55, 62, 73, and 93. 



