INDEX. 



225 



Lamanaky, Stokes's law, 1. 



Lambert's law, applicable to fluorescent solutions, 31, 



39. 

 Lenard: 



Conducting power of phosphorescent sulphides, 198 . 



Decay of phosphorescent sulphides, 124. 



Equation for intensity of kathodo-luminescenee, 

 144. 



Relation between I -' and time, 109. 

 Lenard and Klatt, long-time decay substances, 124. 

 Lommel: 



Classification of fluorescent substances, 3, 23. 



Effect of dilution on fluorescence, 26. 



Fluorescence of quinine sulphate, 16. 



Law of luminescence, 196. 

 Lubarsch, Stokes's law, 1. 

 Luminescence: 



Kathodo, 137-144. 



Thermo, 87-95. 



Theory of, 195-200. 



Micheli, F. J., decay of phosphorescence in Balmain's 

 paint, 99. 



Naphthalin-roth: 



Fluorescence of, 1. 

 Fluorescence spectra, 10. 



Phosphorescence: 



Apparatus for study of rapid decay, 109, 120. 



Change of color during decay, 49. 



Decay curves, 115, 116, 117. 



Distribution of energy in phosphorescence spectra, 



125, 127. 

 Effect of 



Heating, 86, 98, 99, 101, 102, 105, 106, 116, 117. 

 Infra-red rays, 62, 72-S4, 118, 133, 134, 135. 

 Intensity of excitation, 65-67. 

 Previous history, 100. 

 Time of excitation, 60-64, 97, 101-105, 117. 

 Hysteresis effect, 61, 63, 70. 

 Hysteresis vs. temperature, 222. 

 Laws of, 51-53, 202-204. 

 Of aniline dyes, 122. 

 Of cadmium compounds, 124. 

 Of manganese compounds, 122, 123. 

 Suppression of, 71, 77, 134, 135. 

 Theories of, 57, 59, 202-218. 

 Phosphorescent compounds, 110, 111. 

 Photo-electric effect: 



Relation to fluorescence, 164. 

 With fluorescent electrolytes, 152-162. 

 Pierce, C. A.: 



Becquerel's equation of decay of phosphorescence, 



131. 

 Distribution of energy in spectrum of Sidot blende, 



125-127. 

 Form of phosphorescence spectrum, 203. 

 Phosphorescence decay, 85-87, 202, 207, 211. 



Quinine sulphate, fluorescence and transmission spectra 

 of, 15. 



Regner, effect of light on the conductivity of solutions, 



147, 198. 

 Resorcin-blau, fluorescence and transmission spectra 



of, 13. 

 Resorufin: 



Absorption of, 167-174. 



Coefficient of absorption of, 30, 31, 190. 



Effect of thickness on the fluorescence of, 37, 38. 



Distribution of energy in fluorescence spectrum of, 



186. 

 Intensity of fluorescence at various concentrations, 



35,36. 

 Specific exciting power of various wave-lengths on, 



193. 

 Transmission spectrum of, 28. 

 Rhodamin: 



Photo-electric action of, 161. 

 Fluorescence spectrum of, 12. 

 Rutherford: 



Kathodo-luminescenee, 144. 



Law of recombination of ions, 202. 



Sidot blende: 



Distribution of energy in spectra, 125-127. 

 Luminescence 



Due to Roentgen rays, 41, 43, 143. 

 Due to ultra-violet light, 42, 44. 

 Kathodo, 143-147. 

 Intensity of vs. voltage, 143. 

 Thermo, 87-96. 

 Phosphorescence 



Decay of, 47, 48, 53-57. 

 Effect of 



Infra-red rays, 74, 75, 78-81, 118. 

 Various temperatures, 86, 128, 129. 

 Time of excitation, 135. 

 Spectrum 



Change of color, 49. 

 Effect of temperature on, 135. 

 Intensity of color, 45, 48. 

 Sphalerite, absorption bands of, 84. 

 Stark, ionization theory of fluorescence, 163. 

 Stark and Steubing, ionization theory of fluorescenco, 



164. 

 Stenger: 



Effect of solvent on fluorescence spectrum, 23. 

 Stokes's law, 1. 

 Stewart, G. W., energy of spectrum of acetylene, 175. 

 Stokes, fluorescence spectrum of chlorophyll, 17. 

 Stokes's law, 1, 11, 13, 16, 20, 24, 45, 196, 197, 201. 



Thermo-lu minescence : 



Effect of delav in heating, 93, 94. 



In Sidot blende, 85-96. 



Saturation effect, 92. 

 Thompson, J. J., influence of light on conductivity of 



Na vapor, 165. 

 Trowbridge, C. C: 



Decay of phosphorescence in gases, 202. 



Ionic theory of phosphorescence, 200. 

 Tufts, luminosity curve, 185. 



Uranium glass, fluorescence absorption of, 167. 



Vogel, distribution of intensities in spectrum of day- 

 light, 14. 



Waggoner, Dr. C. W.: 



Decay of phosphorescence of Sidot blende, 136. 



Of willemite, 211. 



Form of phosphorescence spectrum, 204. 



Phosphorescence of short duration, 109. 

 Walter, B.: 



Coefficient of absorption, 33. 



Effect of dilution on fluorescence, 26. 

 Wehnelt, kathodo-luminescenee, 144. 

 Werner, A.: 



Form of phosphorescence spectrum, 204. 



Luminescence fatigue, 212. 

 Wesendonck, Stokes's law, 1. 

 Wick, MissF. G.: 



Absorption of resorufin, 25, 167, 190. 



Fluorescence of resorufin, 25. 

 Wiedemann: 



Phosphorescence decay of Balmain's paint, 68. 



Law of phosphorescence decay, 51. 



Theory of luminescence, 195. 

 Wiedemann and Schmidt: 



Effect of infra-red rays on phosphorescence, 213. 



Ionic theory of luminescence, 123, 163, 195. 



Phosphorescent effect of zinc salts as impurities, 

 113. 



Theory of decay of phosphorescence, 57, 59, 202. 

 Wilkinson, analysis of Cd compounds used in experi- 

 ments, 112. 

 Willemite: 



Decay of phosphorescence, 67, 211. 



Luminescence of, 140, 141. 

 Wood, R. W., fluorescence absorption, 167, 172. 



Zeller, C: 



Form of phosphorescence spectrum, 204. 

 Phosphorescence of aniline dyes, manganese com- 

 pounds, and cadmium compounds, 122- 

 124. 

 Zinc sulphide: 



Law of decay of phosphorescence of, 202, 203. 

 {See also "Emanations-pulver" and "Sidot 

 blende.") 



