28 ABSORPTION SPECTRA OF SOLUTIONS. 



19. A . Praseodymium Nitrate in Water. Concentrations, 2.6, 0.026, and 0.0052 normal, 



resp3Ctively. Corresponding depths of cell, 0.5, 50, and 250 cm., respec- 

 tively; most dilute solution nearest numbered scale. 



B. Praseodymium Nitrate in Water. Concentration, 1.3, 0.013, and 0.0026 normal; 



cell depths, 0.5, 50, and 250 cm., respectively. 



C. Praseodymium Nitrate in Water. Concentration, 0.65, 0.0085, and 0.0013 nor- 



mal; cell depths, 0.5, 50, and 250 cm. In each case the most dilute solu- 

 tion is nearest the numbered scale. 



20. A. Uranyl Chloride in Water. Concentrations, 1.363, 0.682, 0.341, 0.227, 0.01363, 



and 0.00272 normal Depths of cell, 0.5, 1, 2, 3, 50, and 250 cm., respec- 

 tively. 

 B. Uranyl Chloride in Water. Concentrations, 0.685, 0.340, 0.170, 0.1135, 0.00685 

 and 0.00136 normal, corresponding depths of absorbing layers being 0.5, 

 1, 2, 3. 50, and 250 cm. The most dilute solution in each case is nearest 

 the numbered scale. 



21. A. Uranyl Bromide in Water. Concentrations, 1.365, 0.682, 0.341, 0.227, 0.01365, 



and 0.00273 normal. Corresponding depths of cell, 0.5, 1, 2, 3, 50, and 

 250 cm. Most dilute solution nearest scale. 

 B. Uranyl Bromide in Water. Concentrations, 0.682, 0.341, 0.171, 0.113, 0.00682, 

 and 0.00136 normal. Corresponding depths of cell, 0.5, 1, 2, 3, 50, and 

 250 cm. 



22. A. Uranyl Nitrate in Water. Concentrations, 1.55, 0.775, 0.387, 0.269, 0.0155, and 



0.0031 normal. Corresponding depths of cell, 0.5, 1, 2, 3, 50, and 250 cm., 

 respectively. 

 B. Uranyl Nitrate in Water. Concentrations, 0.775, 0.387, 0.193, 0.134, 0.00775, 

 and 0.0015 normal, respectively. Corresponding depths of cell, 0.5, 1, 2, 

 3, 50, and 250 cm., respectively. 



