284 INDEX 



Efficiency of light of different colours, 169 

 ,, ,, the spectral rays, 186, 193 



,, ,, photosynthetic organ, 222 



Electric Photometer, 108 ; calibration of, 109 ; determination of hourly 



variation of sky light by, 157 

 Electric response of green leaves to light, 74 



modification of, under variation of temperature, 79 



ether, 79 

 ,, ,, ,, excess of C0 2 , 80 



phenomenon of ' overshooting ' in, 77 

 positive in Hydrilla, 78 



,, acid Cicer arietinum, 125 

 unmasking of positive as after-effect, 76 

 Engelmann, 166 



Factors of photosynthesis, 239 ; effect of variation of, 252 



Flotation, method of, for determining photosynthetic activity under 



light of different colours, 167 

 Formaldehyde, poisonous effect of on photosynthesis, 64 ; stimulatory 

 effect of infinitesimal traces of, 71 ; as first product of photosyn- 

 thesis, 71 



Galvanograph, 102 



Glucose and starch, relative production of, 218 



Growth, curve under variation of temperature, 141 



Half-leaf method, unreliability of, for determining increase of weight, 



199 

 Heilbron, 49 



Helianthus annus, photosynthetic increase of weight in, 199 

 Heterostatic method, determination of photosynthetic efficiency of spectral 



rays by, 188 

 Hourly variation in photosynthesis, automatic apparatus for, 158 ; record 



of, 1 Go ; modifying factors in, 163 

 Hydrilla verticillata, structure of, 8 

 Hysteresis, physiological, 150 



Induction-period, effect of previous darkness on, 85 

 Intermittent light, efficiency of photosynthesis under, 95 

 Iodine, effect of minute traces on photosynthesis, 70 



Jost, quoted, 166, 201 



Krasheninikov, 201 

 Kreussler, 2, 200 



Laws of photosynthesis, 246, 279 



Law of Product, 254, 281 



Light, additive effect of, 190 



,, effect of blue and red on photosynthesis, 170 



, , high photosynthetic efficiency under rapid intermission, 95 



