INDEX. 



PAGE 



Absorption and emission centers 



And the ionization theory 2 



Of light and heat 1 



Absorption spectra 



Of benzene and its derivatives 16 



Of organic compounds 8 



Of various salts in solution, map- 

 ping the > 1 



Acetone 



Neodymium acetate in 40 



Xeodyniium nitrate in 39 



Solution of neodymium nitrate 80 



Solution of uranous chloride 82 



Solution of uranyl chloride 81 



Uranyl nitrate in 44 



Acid solutions of neodymium salts 84 



Acids, strengths of, possible method of 



measuring 62 



Aggregates and their properties 95 



Effect of temperature on 83 



Alcohols, samarium chloride in 49 



Aluminium and calcium chromates 33 



Anthracene, neodymium chloride in 



ethyl acetate and 56 



Apparatus and methods, experimental. . 27 



Arcs and flames, emission centers of. ... 6 



Bands, uranous and uranyl 94 



Benzene 



And its derivatives, absorption 



spectra of 16 



Theories 25 



Bichromate 



And chromate of lithium 33 



Of copper 33 



Butyl alcohol 



Neodymium chloride in 36 



Neodymium nitrate in 3S 



Uranyl chloride in 43 



Calcium 



And aluminium chromates 33 



Ferricyanide and calcium ferro- 



cyanide 32 



Ferrocyanide and calcium ferri- 

 cyanide 32 



Canal-ray spectra, carriers of 4 



Carriers 



Of canal-ray spectra 4 



Of spark spectra 5 



Catalytic action of light 6 



Centers 



Absorption and emission of light 



and heal 1 



Absorption, of uranium spectra. ... 45 

 Emission and absorption, and the 



ionization theory 2 



Emission, of flames and arcs 6 



110 



PAGE 



Chromate 



And bichromate of lithium 33 



Potassium nickel 33 



Chromates 



And cyanides, absorption of certain 31 



Of calcium and aluminium 33 



Chromophores, theory of 10 



( 'upper bichromate 33 



Cyanides and chromates. absorption of 



certain 31 



Description of plates 101 



Discussion of results 87 



Dynamic isomerism, theory of 18 



Dysprosium 



Al (sorption spectrum of 46 



Acetate in water 4s 



Chloride in ethyl alcohol 47 



Chloride in methyl alcohol 47 



Chloride in water 47 



Ether 



Neodymium chloride in 37 



Uranyl chloride in 43 



Ethyl alcohol 



Dysprosium chloride in 47 



Solution of neodymium chloride.. . . 77 



Ethyl ester, neodymium nitrate in.... :;'.> 



Emission and absorption centers 



And the ionization theorv 2 



Of light and heat 1 



Emission 



Centers of flames and arcs 6 



Spectra of organic compounds 7 



Erbium 



( hloride in water 80 



Salts, absorption of solutions of . . . . 33 



Experimental methods and apparatus. . 27 



Flames and arcs, emission centers of . . . 6 

 Ferrocyanide and ferricyanide of calcium 32 

 Formamide 



Neodymium acetate in 40 



Uranyl chloride in 44 



Gadolinium 



Absorption spectrum of 46 



Chloride in ethyl alcohol 46 



Chloride in water 46 



Heat, absorption and emission centers of 1 

 Hydrochloric acid solution of uranyl 



chloride 86 



Ionization theory and absorption and 



emission centers 2 



Ions, are they factors in the absorption 



of lisrht 62 



