148 A STUDY OF THE ABSORPTION SPECTRA. 



Plate 8. A. Potassium Ferrocyanide. Depth of cell constant, 3 mm. Concentrations, 



0.5, 0.37, 0.25, 0.17, 0.12, 0.09, and 0.063 normal. 

 B. Potassium Ferrocyanide. Depth of cell constant, 3 mm. Concentrations, 



0.06, 0.046, 0.032, 0.021, 0.015, 0.011, and 0.008 normal. 

 Plate 9. A. Potassium Ferrocyanide, Beer's Law. Depth of cell, 3, 4, 6, 9, 13, 18, 



and 24 mm. Concentrations, 0.5, 0.37, 0.25, 0.17, 0.12, 0.09, and 



0.063 normal. 

 B. Potassium Ferrocyanide, Beer's Law. Depth of cell, 3, 4, 6, 9, 13, 18, and 



24 mm. Concentrations, 0.06, 0.046, 0.032, 0.021, 0.015, 0.011, and 



0.008 normal. 

 Plate 10. A. Potassium Ferricyanide. Depth of cell constant, 3 mm. Concentrations, 



1, 0.75, 0.5, 0.33, 0.23, 0.166, and 0.125 normal. 

 B. Potassium Ferricyanide. Depth of cell constant, 3 mm. Concentrations, 



0.125, 0.094, 0.0625, 0.0425, 0.029, 0.0208, and 0.0156 normal. 

 Plate 11. A. Potassium Ferricyanide. Depth of cell constant, 3 mm. Concentra- 

 tions, 0.0156, 0.0118, 0.0078, 0.0053, 0.0036, 0.0026, and 0.0019 



normal. 

 B. Potassium Ferricyanide. Depth of cell constant, 3 mm. Concentra- 

 tions, 0.0019/0.0013, 0.001, 0.0066, 0.00045, 0.00032, and 0.00024 



normal. 

 Plate 12. A. Potassium Ferricyanide, Beer's Law. Depth of cell, 3, 4, 6, 9, 13, 18, and 



24 mm. Concentrations, 1, 0.75, 0.5, 0.33, 0.23, 0.166, and 0.125 



normal. 

 B. Potassium Ferricyanide, Beer's Law. Depth of cell, 3, 4, 6, 9, 13, 18, and 



24 mm. Concentrations, 0.125, 0.094, 0.062, 0.042, 0.029, 0.021, and 



0.0156 normal. 

 PLATEri3. A. Cobalt Chloride in Water. 2.37 normal concentration. 1.3 mm. depth of 



cell. Temperatures, 2, 14, 30, 45, 60, 70, 81 C. Length of ex- 

 posure, 3 minutes. 

 B. Cobalt Chloride. 0.315 normal concentration. 10.4 mm. depth of cell. 



Temperatures, 2, 14, 30, 44, 60, 75, Sl C. Length of exposure, 3 



minutes. 

 Plate7.14. A. Cobalt Chloride. 0.04 normal concentration. S3 mm. depth of cell. 



Temperatures, 14, 30, 44, 58, 72, 80 C. Length of exposure, 4 



minutes. 

 B. Cobalt Nitrate. 2.3 normal concentration, 2 mm. depth of cell. Tem- 

 peratures, 2, 14, 2S, 45, 60, 75, 85 C. Length of exposure, 3 



minutes. 

 Plate 15. A. Cobalt Chloride. 0.125 normal. 12 mm. depth of cell. Temperatures, 



5, 20, 38, 52, 64, and 83 C. Length of exposure, 4 minutes. 

 B. Cobalt Nitrate. 0.29 normal. 3 mm. depth of cell. Temperatures, 13, 



27, 42, 61, 73, and 85 C. Length of exposure, 2 minutes. 

 Plate 16. A. Cobalt Sulphate. 1.0 normal. 3 mm. depth of cell. Temperatures, 6, 



19, 36, 49, 64, and 80 C. Length of exposure, 2 minutes. 

 B. Nickel Sulphate. 2.0 normal. 3 mm. depth of cell. Temperatures, 5, 



19, 32, 47, 61, 72, and 81 C. Length of exposure, 2 minutes. 

 Plate 17. A. Cobalt Acetate. 1.0 normal. 3 mm. depth of cell. Temperatures, 4, 



18, 32, 50, 64, 80 C. Length of exposure, 2 minutes. 

 B. Cobalt Acetate. 0.125 normal. 24 mm. depth of cell. Temperatures, 7, 



27, 47, 61, 73, and 81 C. Length of exposure, 2 minutes. 

 Plate 18. A. Cobalt and Calcium Chlorides. Cobalt Chloride, 0.237 normal; Calcium 



Chloride, 4.14 normal. Temperatures, 2, 15, 30, 42, 58, 75, 86 C. 



Length of exposure, 3 minutes. 3 mm. depth of cell. 

 B. Cobalt and Aluminium Chlorides. Cobalt Chloride, 0.221 normal; Alumin- 

 ium Chloride, 2.75 normal. Temperatures, - 1.0, 12, 32, 45, 60, 72, 



and 87 C. Length of exposure, 3 minutes. 



