Response to positive variation of turgor—Method of irrigation—Effect of artificial increase of internal hydrostatic pressure—Response to negative variation of turgor—Method of plasmolysis—Effect of alternative variations of turgor on growth—Response of motile and growing organs to variation of turgor—Effect of external tension[188]
XIV.—EFFECT OF ELECTRICAL STIMULUS ON GROWTH.
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.