DESCRIPTION OF THE PLATES. 151 



Plate 43. A. Neodymium Chloride in Water and Ethyl Alcohol. Solution contained 8 

 per cent water. 

 Strips 1, 2, 3, 4, Beer's Law. Concentrations of NdCl 3 , 0.5, 0.3, 0.1, and 



0.05 normal. 

 Strips 5, 6, 7. Concentration, 0.5 normal. Depth of cell changed. 

 B. Neodymium Acetate in Water. Strip 1 represents the Neodymium Acetate 

 solution in Water. Succeeding strips show the effect of adding more 

 and more Hydrobromic Acid. 

 Plate 44. A. Neodymium Acetate in Water. 0.041 normal. Strip 1, pure aqueous 

 solution. Strip 2, the same to which one drop of HC1 has been 

 added. Succeeding strips represent the addition of more and more HC1. 

 B. Mixtures of Neodymium Acetate and Neodymium Chloride in Water. Strip 

 1, all Neodymium Acetate. Strip 7, all Neodymium Chloride. 

 Plate 45. A. Neodymium Acetate in Water. Depth of cell, 30 mm. Concentration of 

 Acetate, 0.041 normal. Concentration of Hydrochloric Acid, 0.113, 0.226, 

 0.566, 1.13, 3.95, 7.91, and 15.82. 

 B. Neodymium Citrate in Water. Depth of cell, 30 mm. Strip 2 and succeed- 

 ing strips show the effect of the addition of HC1. 

 Plate 46. A. Strip 1. 0.15 normal NdCl 3 and A1C1 3 in Glycerol at 10 C. 

 Strip 2. Same at 200 C. 



Strip 3. 0.15 normal NdCl 3 and CaCl 2 in Glycerol at 10 C. 

 Strip 4. Same at 200 C. 



Strip 5. Uranous and Aluminium Chlorides in Water at 10 C. 

 Strip 6. Same at 100 C. 

 B. Neodymium Acetate in Water. 0.041 normal. 9 mm. depth of cell. Con- 

 centrations of HN0 3 , 0.117, 0.234, 0.585, 1.17, 4.09, 8.18, and 16.36 

 normal. The reaction took place between the second and third strips 

 in this case. 

 Plate 47. A. Strip 1. Neodymium Chloride in Water. 



Strip 2. Same solution to which about ten times its volume of strong HC1 



has been added. 

 Strip 3. Neodymium Chloride in HC1 at 10 C. 

 Strip 4. The same at 100 C. 

 Strip 5. Uranous Acetate at 10 C. 

 Strip 6. The same at 100 C. 

 B. Strip 1. Uranyl Nitrate in Strong Nitric Acid at 10 C. 

 Strip 2. The same at 100 C. 

 Strip 3. The same at 10 C. 



Strip 4. Neodymium Nitrate in Nitric Acid at 10 C. 

 Strip 5. The same at about 90 C. 

 Strip 6. Neodymium Chloride in Water. 

 Plate 48. A. Uranyl Chloride in Water. Beer's Law. Concentrations, 0.12, 0.16, 0.2, 

 0.33, 0.5, 0.75, and 1.0 normal. Depths of cell, 24, 18, 13, 9, 6, 4, 

 and 3 mm. 

 B. Uranyl Chloride in Water. Depth of cell constant, 3 mm. Concentrations, 

 0.12, 0.16, 0.2, 0.33, 0.5, 0.75, and 1.0 normal. 

 Plate 49. A. Uranyl Chloride in Water. Concentration constant, 0.2 normal. Depth 

 of cell, 3, 6, 12, 24, and 35 mm. This plate is to show how much weaker 

 the uranyl bands are in a pure aqueous solution, compared with a solu- 

 tion containing some other salt or hydrochloric acid. 

 B. Uranyl and Aluminium Chlorides in Water. Concentration Uranyl Chloride, 

 0.2 normal, Aluminium Chloride, 2.43 normal. Depths of cell, 3, 6, 12, 

 24, and 35 mm. 

 Plate 50. A. Uranyl and Zinc Chlorides in Water. Concentration Uranyl Chloride, 0.2 

 normal. Zinc Chloride almost saturated. Depths of cell, 3, 6, 12, 24, 

 and 35 mm. 

 B. Uranyl Chloride and Hydrochloric Acid. Concentration Uranyl Chloride, 

 0.2 normal; Hydrochloric Acid very strong. Depth of cell, 3, 6, 12, 24, 

 and 35 mm. 



