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LIFE MOVEMENTS IN PLANTS

PART II.

GROWTH AND ITS RESPONSIVE VARIATIONS.


X.—THE HIGH MAGNIFICATION CRESCOGRAPH FOR RESEARCHES ON GROWTH.

page.

Method of high magnification—Automatic record of the rate of growth—Determination of the absolute rate of growth—Stationary method of record—Moving plate method—Precaution against physical disturbance—Determination of latent period and time-relations of response—Advantages of the Crescograph—Magnetic amplification—The Demonstration Crescograph
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XI.—EFFECT OF TEMPERATURE ON GROWTH.

Method of discontinuous observation—Method of continuous observation—Determination of the cardinal points of growth—The Thermocrescent curve—Relation between temperature and growth
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XII.—EFFECT OF CHEMICAL AGENTS ON GROWTH.

Effect of stimulants—Effect of anæsthetics—Action of different gases—Action of poisons
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XIII.—EFFECT OF VARIATION OF TURGOR AND OF TENSION ON GROWTH.

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
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