CONTENTS. 



CHAPTER I. PAGE 



INTRODUCTORY 1 



Apparatus 6 



Photographic Material, etc 7 



Sources of Light 8 



Making a Spectrogram 9 



CHAPTER II. 



SALTS OF COBALT 11 



Cobalt Chloride in Water Beer 's Law 13 



Cobalt Chloride in Water Number of Ions in the Path of the Beam of Light 



Constant 15 



Cobalt Chloride in Water Molecules Constant 15 



Cobalt Chloride in Methyl Alcohol Beer's Law 16 



Cobalt Chloride in Ethyl Alcohol Beer's Law 17 



Cobalt Chloride in Acetone Beer's Law 18 



Cobalt Chloride in Methyl Alcohol with Water 19 



Cobalt Chloride in Ethyl Alcohol with Water 20 



Cobalt Chloride in Acetone with Water 21 



Cobalt Bromide in Water Beer's Law 22 



Cobalt Bromide in Water Molecules Constant 22 



Cobalt Bromide with Calcium Bromide 23 



Cobalt Bromide in Methyl Alcohol Beer's Law 25 



Cobalt Bromide in Ethyl Alcohol Beer's Law 25 



Cobalt Bromide in Acetone Beer's Law 26 



Cobalt Bromide in Methyl Alcohol with Water 27 



Cobalt Bromide in Ethyl Alcohol with Water 27 



Cobalt Bromide in Acetone with Water 28 



Cobalt Nitrate in Water Beer's Law 29 



Cobalt Nitrate in Water Molecules Constant 30 



Cobalt Sulphate in Water Beer's Law 31 



Cobalt Sulphocyanate in Water Beer's Law 32 



Cobalt Sulphocyanate in Water Molecules Constant 33 



Cobalt Acetate in Water Beer's Law 34 



General Summary of Results with Cobalt Salts 35 



CHAPTER III. 



SALTS OF NICKEL 39 



Nickel Chloride in Water Beer's Law 39 



Nickel Chloride in Water Ions Constant 40 



Nickel Chloride in Water Molecules Constant . 41 



Nickel Chloride in Water with Calcium and Aluminium Chlorides 41 



Nickel Sulphate in Water Beer 's Law 42 



Nickel Acetate in Water Beer's Law 43 



CHAPTER IV. 



SALTS OF COPPER 45 



Copper Chloride in Water Beer's Law 45 



Copper Chloride in Water Molecules Constant 46 



Copper Chloride in Methyl Alcohol Beer's Law 46 



Copper Chloride in Ethyl Alcohol Beer's Law 47 



Copper Chloride in Acetone Beer's Law 48 



v 



