DESCRIPTION OF THE PLATES. 



149 



B. 



Plate 20. A. 



2 minutes exposure. 

 2 minutes exposure. 

 2 minutes exposure. 

 2 minutes exposure. 

 Length of exposure, 

 Length of exposure, 



Plate 19. A. Cobalt and Aluminium Chlorides. Cobalt Chloride, 0.00316 normal; 

 Aluminium Chloride, 3.06 normal. Depth of cell, 150 mm. Tem- 

 peratures, 3, 18, 41, 55, 68, and 85 C. Length of exposure, 2 

 minutes. 

 Cobalt and Calcium Chlorides. Cobalt Chloride, 0.00948 normal; Calcium 

 Chloride, 4.6 normal. Depth of cell, 50 mm. Temperatures, 1, 20, 

 32, 45, 58, 75, 88 C. Length of exposure, 3 minutes. 

 Cobalt Sulphocyanate. 2 normal. 1 mm. depth of cell. Temperatures, 

 3, 18, 31, 45, 60, and 80 C. Length of exposure, 3 minutes. 

 B. Cobalt Sulphocyanate. 0.25 normal. 8 mm. depth of cell. Tempera- 

 tures, 6, 20, 33, 47, 59, 73, and 80 C. Length of exposure, 2 

 minutes. 

 Plate 21. A. Nickel Chloride. 0.332 normal. 16 mm. depth of cell. 

 Temperatures, 5, 19, 33, 45, 60, 71, 82 C. 

 B. Nickel Chloride. 2.66 normal. 2 mm. depth of cell. 

 Temperatures, 5, 18, 30, 44, 57, 75, 85 C. 

 Plate 22. A. Nickel Acetate. 0.5 normal. 9 mm. depth of cell. 

 Temperatures, 6, 23, 38, 52, 64, 74, 84 C. 

 B. Nickel Acetate. 0.5 normal. 3 mm. depth of cell. 

 Temperatures, 5, 20, 33, 46, 60, 71, 81 C. 

 Plate 23. A. Copper Bromide. 2.06 normal. 1 mm. depth of cell. 

 2 minutes. Temperatures, 6, 17, 30, 45, 71 C. 

 B. Copper Bromide. 0.25 normal. 8 mm. depth of cell. 



2 minutes. Temperatures, 6, 17, 31, 46, 59, 71, 85 C. 

 Copper Nitrate. 4.04 normal. 2 mm. depth of cell. Length of exposure, 



2 minutes. Temperatures, 5, 15, 30, 45, 60, 76, 87 C. 

 Copper Nitrate. 0.505 normal. 16 mm. depth of cell. Length of exposure, 



3 minutes. Temperatures, 1, 15, 30, 45, 60, 75, 82 C. 

 Chromium Nitrate. 0.754 normal. 3 mm. depth of cell. Length of 



exposure, 2 minutes. Temperatures, 7, 18, 32, 46, 59, 73, and 

 84 C. 

 B. Copper Nitrate. 4.04 normal. 3 mm. depth of cell. Length of exposure, 

 3 minutes. Temperatures, 4, 16, 33, 46, 59, 71, 82 C. 

 Plate 26. A. Chromium Nitrate. 0.754 normal. 3 mm. depth of cell. 3 minutes exposure. 

 Temperatures, 5, 17, 32, 45, 60, 71, 81 C. 



Chromium Nitrate. 0.094 normal. 24 mm. depth of cell. 3 minutes ex- 

 posure. Temperatures, 7, 17, 33, 44, 59, 69 C. 



Chromium Chloride. 0.125 normal Chromium Chloride. 2.28 normal 

 Aluminium Chloride. 9 mm. depth of cell. Length of exposure, 4 min- 

 utes. Temperatures, 6, 19, 36, 51, 66, 81 C. 



Chromium Chloride. 0.125 normal Chromium Chloride. 3.45 normal 

 Calcium Chloride. 9 mm. depth layer. 5 minutes exposure. Tempera- 

 tures, 6, 19, 31, 45, 64 C. 



Chrome Alum KCr(S0 4 ) 2 . 0.0083 normal. 9 mm. depth of cell. 3 min- 

 utes exposure. Temperatures, 5, 18, 33, 46, 61, 71, 83 C. 



Chromium Sulphate. 0.125 normal. 3 mm. depth of cell. 4 minutes ex- 

 posure. Temperatures, 5, 20, 37, 51, 66, 82 C. 

 Plate 29. A. Strip 1. ErCl 3 in Glycerol. Temperature 15 C. 



Strip 2. ErCl 3 in Glycerol. Temperature 200 C. 



Strip 3. U(S0 4 ) 2 in Glycerol. Temperature 15 C. 



Strip 4. U(S0 4 ) 2 in Glycerol. Temperature 200 C. 

 B. Strip 1. NdCl 3 in Glycerol. Temperature 15 C. Concentration 0.02 normal. 



Strip 2. NdCl 3 in Glycerol. Temperature 200 C. Concentration 0.02 normal. 



Strip 3. NdCl 3 in Glycerol. Temperature 15 C. Concentration 0.15 normal. 



Strip 4. NdCl 3 in Glycerol. Temperature 200 C. Concentration 0.15 normal. 



Strip 5. ErCl 3 in Glycerol. Temperature 15 C. 



Strip 6. ErCl 3 in Glycerol. Temperature 200 C. 



Plate 24. A. 



B. 



Plate 25. A. 



B. 



Plate 27. A. 



B. 



Plate 28. A. 



B. 



