CONTENTS. 



PA.OE. 



Chapter I. The Absorption and Emission Centers of Light and Heat: 



Atomic Structure and Spectra 1 



The Ionization Theory and Absorption and Emission Centers 2 



Sulphur Bands 3 



The Carriers of Canal-Ray Spectra 4 



The Carriers of Spark Spectra 5 



The Emission Centers of Flames and Arcs t> 



Schumann Waves G 



The Possible Catalytic Action of Light (' 



Emission Spectra of Organic Compounds 7 



The Absorption Spectra of Organic Compounds 8 



The Unit of this Absorption 8 



The Theory of Chromophores 10 



Influence of the Solvent 15 



The Absorption Spectra of Benzene and Its Derivatives 16 



Theory of Dynamic Isomerism ' 18 



Theory of Stark 23 



Other Benzene Theories 24 



Chapter II. Experimental Methods and Apparatus: 



Chapter III. Mapping the Absorption Spectra of Various Salts in Solution: 



The Absorption of Certain Cyanides and Chromates 31 



Calcium Ferrocyanide and Calcium Ferricyanide 32 



The Chromate and Bichromate of Lithium 33 



Aluminium and Calcium Chromates 33 



Potassium Nickel Chromate and Copper Bichromate 33 



The Absorption of Solutions of Certain Erbium Salts 33 



The Absorption of Solutions of Certain Neodymium Salts 34 



Neodymium Chloride in Water 35 



Neodymium Chloride as a Methyl Alcoholate 35 



Neodymium Chloride in Propyl Alcohol 30 



Neodymium Chloride in Isopropyl Alcohol 30 



Neodymium Chloride in Butyl Alcohol 36 



Neodymium Chloride in Isobutyl Alcohol 37 



Neodymium Chloride in Ether 37 



Neodymium Nitrate in Propyl Alcohol 38 



Neodymium Nitrate in Isopropyl Alcohol 38 



Neodymium Nitrate in Butyl Alcohol 38 



Neodymium Nitrate in Isobutyl Alcohol 39 



Neodymium Nitrate in Acetone 39 



Neodymium Nitrate in Ethyl Ester 39 



Neodymium Acetate in Acetone 40 



Neodymium Acetate in Formamide 40 



Summary of Neodymium Spectra 40 



The Absorption Spectrum of Solutions of Certain Salts of Uranium 43 



Uranyl Chloride in Propyl Alcohol 43 



Uranyl Chloride in Isopropyl Alcohol 43 



Uranyl Chloride in Butyl Alcohol 43 



Uranyl Chloride in Isobutyl Alcohol 43 



Uranyl Chloride in Ether 43 



Uranyl Chloride in Methyl Ester 44 



Uranyl Chloride in Ethyl Ester 44 



Uranyl Chloride in Formamide 44 



Uranyl Nitrate in Propyl Alcohol 44 



Uranyl Nitrate in Acetone 44 



Uranyl Nitrate in Methyl Ester 44 



Uranous Chloride in Propyl Alcohol 44 



Uranous Chloride in Isobutyl Alcohol 45 



Uranous Chloride in Methyl Ester 45 



The Absorption Centers of Uranium Spectra 45 



The Absorption Spectrum of Gadolinium 46 



Gadolinium Chloride in Water 46 



Gadolinium Chloride in Ethyl Alcohol 46 



vii 



