Vlll CONTENTS. 



Chapter VII. Chromium Salts continued. 



Chromium Chloride and Calcium Chloride 52 



Chromium Nitrate 53 



Chromium Sulphate 53 



Chromium Acetate 54 



Chrome Alum 54 



Chromium Chloride in Water, Conductivity and Temperature 55 



Chromium Nitrate in Water, Conductivity and Coefficients 55 



Chapter VIII. Erbium Salts 57 



Erbium Chloride in Glycerol 63 



Erbium Chloride in Water, Effect of Temperature 63 



Absorption Spectra of Erbium Nitrate and other Salts of Erbium 64 



Chapter IX. Praseodymium Salts 65 



Introduction 65 



Praseodymium Chloride 65 



Praseodymium Nitrate 66 



Chapter X. Neodtmium Salts 69 



Introduction 69 



The Effect of Rise in Temperature on the Absorption Spectra of Aqueous Solutions 



of Neodymium Salts 72 



Neodymium Salts in Glycerol 78 



Neodymium Nitrate in Nitric Acid 79 



Spectrophotography of Chemical Reactions 79 



Summary 83 



Chapter XL Uranium Salts 85 



The Absorption Spectra of Uranium Compounds 85 



The Absorption Spectrum of Uranyl Chloride 89 



Uranyl Chloride in Aqueous Solutions 89 



Uranyl, Calcium, Aluminium, and Zinc Chlorides in Water 91 



Uranyl Chloride in Methyl Alcohol 93 



Uranyl Chloride and Calcium Chloride in Methyl Alcohol 94 



Uranyl Chloride in Methyl Alcohol and Water 95 



Uranyl Chloride in Ethyl Alcohol 96 



Uranyl Chloride in Glycerol 97 



Uranyl Chloride in Mixtures of Glycerol and Methyl Alcohol 97 



Uranyl Chloride in Acetone and the Effect of Hydrochloric Acid on the Uranyl 



Acetate Bands 97 



Uranyl Chloride in Acetone and Water 98 



Uranyl Chloride, Temperature Effect 98 



Absorption Spectrum of Anhydrous Uranyl Chloride 99 



Absorption Spectrum of Uranyl Nitrate under Different Conditions 99 



Uranyl Nitrate in Aqueous Solution 99 



Absorption Spectrum of Uranyl Nitrate Crystals 101 



Effect of Dilution on the Uranyl Bands 102 



Uranyl Nitrate in Nitric Acid 102 



Uranyl Nitrate in Methyl Alcohol 103 



Uranyl Nitrate in Methyl Alcohol and Water 103 



Uranyl Nitrate in Ethyl Alcohol 105 



Uranyl Nitrate in Mixtures of Glycerol, Water, Acetone, and Ethyl Alcohol. 106 



Uranyl Nitrate, Temperature Effect 106 



Absorption Spectrum of Anhydrous Uranyl Nitrate 107 



Uranyl Bromide in Water 108 



Uranyl Sulphate, Temperature Effect 108 



Uranyl Sulphate Mixed with Concentrated Sulphuric Acid 109 



Uranyl Acetate in Water 110 



Anhydrous Uranyl Acetate Ill 



Uranyl Acetate in Methyl Alcohol Ill 



