Page:Life Movements in Plants.djvu/25

XIV.—EFFECT OF ELECTRICAL STIMULUS ON GROWTH.

page.

Effect of intensity—Effect of continuous stimulation—Continuity between 'incipient' and actual contraction—Immediate effect and after-effect •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

195

XV.—EFFECT OF MECHANICAL STIMULUS ON GROWTH.

Effect of mechanical irritation—Effect of wound •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

200

XVI.—ACTION OF LIGHT ON GROWING ORGANS.

Method of experiment—Normal effect of light—Determination of the latent period—Effect of intensity of light—Effect of continuous light—Effects of different rays of the spectrum •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

205

XVII.—EFFECT OF INDIRECT STIMULUS ON GROWTH.

Mechanical and electrical response to Indirect Stimulus—Variation of growth under Indirect Stimulus—Effects of Direct and Indirect Stimulus •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

213

XVIII.—RESPONSE OF GROWING ORGANS IN STATE OF SUB-TONICITY.

Theory of assimilation and dissimilation—Unmasking of positive effect—Modification of response under artificial depression of tonic condition—Positive response in sub-tonic specimen—Abnormal acceleration of growth under stimulus—Continuity between abnormal and normal responses—Positive response to sub-minimal stimulus •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

219