SUBJECT INDEX 



751 



Ferns, chlorophyll production in dark, 



396 

 Ferric salts as Hill reagents, 323 

 Ficus sp., 349 



Field, visual {see Visual field) 

 Filtering, internal, effect on action spec- 

 tra, 361, 363 

 Filters, birefringence, 201 

 Christiansen, 198 



copper sulfate, 197 " 



dielectric film, 201 

 differential, 526 



dye solutions and films, 197-198 

 Fabry-Perot, 199-200 

 ferrous ammonium sulfate, 197 

 frustrated total-reflection, 201 

 gelatin, 198 

 glass, 198 

 neutral, 214 

 optical, 198 

 polarization, 201 

 selective absorption, 194 

 Viscor, 239 

 water, 195-196 

 Wratten, 198 

 Firefly, sensitivity to infrared, 670 

 Fissurella, ocelli, 640 

 Flames, chemiluminescence, 55 

 Flashing-light experiments on photosyn- 

 thesis, 323, 324, 331 

 Flicker detection, 649 

 Flicker-fusion rates, 649, 664, 668 

 Flower visits of insects, 666 

 Flowering hormone, 496 

 Fluorescence, 4, 11-13, 83, 84, 114, 299, 

 306, 310, 311, 324, 343, 341 

 action spectra for, 308, 309 

 activators, 114, 115 

 of bacteriochlorophyll, 308, 311-314, 



316 

 of chlorophyll, 46, 59, 299, 301, 304, 



306-310, 327, 331, 334 

 depolarization, 43 

 diffusion-limited, 38 

 of hydrocarbons, 16 

 induction phenomena, 311, 314, 315, 



341 

 influence on, of carbon dioxide, 312- 

 314 

 of cyanide, 314, 315, 326 

 of hydrogen donor, 311-313 

 of intermittent hght, 327 

 of light intensity, 311-314 

 of oxygen, 314, 315 

 of temperature, 311 

 lifetimes, 84, 85, 91 

 mercury, 39, 41 

 of organic molecules, 16 

 in photodynamic action, 698, 701 



Fluorescence, and photosensitization, 18 



protochlorophyll, 405, 406 



and quenching, 37 

 internal, 85 



sensitized {see "Sensitized" fluores- 

 cence) 



{See also Energy transfer; Spectra) 

 Fluorescent lamps, 178-184 



application, 184 



ballast, 183 



cathodes, 183 



electrical characteristics, 183 



flicker, 179 



intensity, 182 



luminous efficiency, 180-181 



phosphors, 178-179 



spectrum, 179 



temperature, 181 

 color, 179 

 operating, 181 

 Flux, luminous, 127 



radiant, 127 

 Foot candle, definition, 137 

 Foot lambert, definition, 137 

 Forbiddenness (selection rules), angular 

 momentum, 84, 100 



even-even, odd-odd, 76, 77, 103 



n-ir or n-g, 84, 91 



singlet-triplet, 82-84 

 Force constant, 3 

 Formaldehyde, 319, 320, 323 

 Formic acid, 319, 320 

 Franck-Condon principle, 3 

 Free-electron niodel or method, 71, 73 



correspondence with LCAO method, 71 



intensity predictions, 76 

 Frequency, fundamental, of vibration, 3 



of radiant energy, 130 131 

 Fresnel, definition, 131 

 Fruit coats, removal, 533-534, 537 

 Fucoxanthin, 305, 306, 308, 331, 332 

 Fumaric acid, 320, 323 



G 



Galvanometers, 243 

 7 (ratio), 270, 271 



definition, 260 

 Gammarus, compound eyes, 655 



eye-pigment migration, 669 



genetics of eye-pigment loss, 655 

 Gas analysis, 266, 280 

 Gaseous discharge lamps, cathodes, 164 



electrical characteristics, 165 



Geisler tube, 178 



general characteristics, 164 



glow lamp, 178 



life of, 166 



(iSee also Arcs, carbon, mercury) 



