iv LIFE MOVEMENTS IN PLANTS 



XXXIII.— TRANSMITTED EFFECT OF PHOTIC STIMULATION. 



Effect of light applied on tip of Sctaria — Response of 

 growing region to unilateral stimulus — Effect of simul- 

 taneous stimulation of the tip and the hj-pocotyl — 

 Algebraical summation of effects of direct and indirect 

 stimuli .......... 302 



XXXIV.— ON PHOTONASTIC CURVATURES. 



Phototropic response of anisotropic organs — Positive 

 pnra-heliotropism — Negative para-heliotropisni — Responses 

 of pulvi nated and growing organs to light . . 378 



XXXV.— EFFECT OF TEMPERATURE ON PHOTOTROPIC 

 CURVATURE. 



Effect of temperature on excitability — Effect of tempera- 

 ture on conduction — Phototropic response of tendrils — 

 Seasonal variation of phototropic curvature — Antagonistic 

 effects of light and of rise of temperature . . 388 



XXXVL— ON PHOTOTROPIC TORSION. 



Torsional response to light — Effect of different modes 

 of lateral stimulation — Effect of differential excitability 

 on the direction of torsion — Laws of torsional 

 response — Complex torsion under light — Advantages of 

 the Method of Torsional Response — The Torsional 

 Halance — Determination of the direction of stimulus . 397 



XXXVII.— RADIO-THERMOTROPISM. 



Effect of infra-red radiation — Positive radio-thermotropism 



— Dia-radio-thermotropism — Negative radio-thermotropism 410 



