INDEX 441 



Geotropic torsion, diurnal variation of, 273, 274 ; induction of, under 

 lateral stimulus of gravity, 307 ; determination of direction of 

 geotropic stimulus by, 308 ; algebraical summation of phototropic 

 and, 308 ; balance of phototropic and, 309 



Growth : determination of absolute rate of, by High Magnification 

 Crescograph, 15, and by Balanced Crescograph, 26, 30 ; pulsation 

 in, 18 ; variation of temperature on, 18, 422 ; determination of 

 cardinal points of temperature on, 36 ; Thermocrescent Curve 

 of, 39 ; effect of carbonic acid gas on, 32, 44, 293, 422 ; ether vapour 

 on, 44 ; chloroform on, 46 ; revival of, under ether and chloroform, 

 44, 46 ; effect of sulphuretted hydrogen on, 48 ; copper sulphate 

 solution on, 49 ; modifying effect of dose on, 49 ; revival of, under 

 irrigation, 51 ; variation of rate of ascent of sap on, 52, 421 ; acces- 

 sion or withdrawal of water on, 55 ; parallel effect in response of 

 motile organ, 56 ; effect of hydrostatic pressure on, 59 ; external 

 tension on, 60 



Growth recorders : the Optical Lever, 5 ; the High Magnification 

 Crescograph, 6, 420 ; precautions against physical disturbance in 

 employment of, 16 ; the Magnetic Crescograph, 19 



Growth, responsive variation of : identical reaction under diverse modes 

 of stimulation, 62 ; latent period of, under electric stimulation, 64 ; 

 incipient contraction or retardation of growth under stimulation, 67 ; 

 continuity between incipient and actual contraction, 67 ; similarity 

 of response of pulvinated and of growing organs, 68 ; effect of photic 

 stimulation on, 72 ; latent period of response, 73 ; effect of increasing 

 intensity of light on, 74 ; after-effect of light on, 75 ; effect of different 

 rays of visible spectrum on, 78 ; of subminimal stimulation in 

 enhancement of, 82 ; enhancement of, in subtonic plants under 

 stimulation, 85 ; revival of growth under stimulation, 84 ; effect of 

 mechanical stimulation on, 87 ; of wound on, 89 ; of direct and indirect 

 stimulation on, 91, 124 



Haberlandt, quoted, 321, 342 ; cited, 329, 373 



Helianthus annuus : effect of ether vapour on growth of, 44 ; electric 



response at proximal and distal sides of stem under unilateral photic 



stimulation, 130 

 Hibiscus, growth of : normal rate of, 12 ; ether vapour on, 44 

 High-Frequency Alternating Current, see Alternating field of electric 



force and Wireless stimulation 

 Hydrion concentration theory, 302 n. 

 Hydrogen peroxide, effect of, on growth, 43 

 Hydrostatic pressure, effect of, on growth, 59 



Impulse : initiation of positive and negative, under stimulation, 124 ; 



velocity of, 120; longitudinal transmission of, 118; transverse 



transmission of, under photic, electric, and radio-thermal stimulation, 



121, 122, 123 

 Indirect stimulation, effect of : on growth, 93, 125, 126, 127 ; on tropic 



curvature of shoot and root, 125, 141, 142, 365 ; on autonomous 



torsion, 399, 403 

 Indirect stimulation, inhibitory action of, on tropic response of tendril, 99 



