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قراءة كتاب Life Movements in Plants, Volume II
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اللغة: English
الصفحة رقم: 2
BOSE.
October 1919.
CONTENTS.
| PART III. TROPISM IN PLANTS. |
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| PAGE. | |
| XXII.—THE BALANCED CRESCOGRAPH. | |
| Principle of the Method of Balance—Compensating movement—Growth-scale—Sensitiveness of the Crescographic Balance—Effect of CO2—Effect of anæsthetics | 255 |
| XXIII.—ON TROPIC MOVEMENTS. | |
| Complexity of the problem—Contradictory nature of responses—Two classes of tropic responses—Longitudinal transmission of effect of stimulus—Transverse transmission of effect of stimulus—Modification of tropic curvature by conducting power of tissues and differential excitability of the organ | 268 |
| XXIV.—TROPIC CURVATURE WITH LONGITUDINAL TRANSMISSION OF EFFECT OF STIMULUS. | |
| Dual impulses, positive and negative, caused by stimulus—Direct and Indirect stimulus—Tropic effect of Indirect stimulation | 271 |
| XXV.—TROPIC CURVATURE WITH TRANSVERSE TRANSMISSION OF EFFECT OF STIMULUS. | |
| Turgor variation under transverse transmission of stimulus-effect—Tropic responses of pulvinated and growing organs to unilateral stimulation—Direct unilateral stimulation—Indirect unilateral stimulation—Difference of effects induced by Direct and Indirect stimulation—Laws of tropic curvature | 279 |
| XXVI.—MECHANOTROPISM: TWINING OF TENDRILS. | |
| Anomalies of mechanotropism—Effects of indirect and direct electric stimulation on growth of tendril—Effect of direct and indirect mechanical stimulus—Immediate and after-effect of stimulus—Inhibitory action of stimulus—Response of less excitable side of the tendril—Relative intensities of responses of upper and under sides of tendril of Passiflora—Negative curvature of tendril | 288 |
| XXVII.—ON GALVANOTROPISM. | |
| Polar effects of electric current on growth—Effect of anode and cathode on growth | 301 |
| XXVIII.—ON THERMONASTIC PHENOMENA. | |
| Effect of temperature—Different thermonastic organs—Two types of response: Positive and Negative—Effect of rise of temperature and of stimulus on thermonastic organs—Law of thermonastic reaction | 305 |
| XXIX.—ON PHOTOTROPISM. | |
| Complexity of problem of phototropic reaction—Action of light—Positive phototropic curvature of pulvinated organs—Positive phototropic curvature of growing organs—Phenomenon of recovery—Immediate and after-effect of light on growth—Latent period of phototropic reaction—Growth variation induced by flash of light from a single spark—Maximum positive curvature under continued action of light | 313 |
| XXX.—DIA-PHOTOTROPISM AND NEGATIVE PHOTOTROPISM. | |
| Differential excitability of two halves of pulvinus of Mimosa—Transformation of positive to negative curvature—Tropic effect under sunlight—Negative phototropism of shoot and root | 328 |
| XXXI.—RELATION BETWEEN THE QUANTITY OF LIGHT AND THE INDUCED PHOTOTROPIC CURVATURE. | |
| Effect of increasing intensity of light on pulvinated and growing organs—Effect of increasing angle—Effect of duration of exposure | 338 |
| XXXII.—THE PHOTOTROPIC CURVE AND ITS CHARACTERISTICS. | |
| Summation of stimulus—General consideration—The general characteristic curve—Characteristics of simple phototropic curve—Variation of susceptibility for excitation in different parts of the curve—Effect of sub-minimal stimulus—The complete phototropic curves of pulvinated and growing organs—Limitation of Weber's law | 346 |
| XXXIII.—TRANSMITTED EFFECT OF PHOTIC STIMULATION. | |
| Effect of light applied on tip of Setaria—Response of growing region to unilateral stimulus—Effect of simultaneous stimulation of the tip and the hypocotyl—Algebraical summation of effects of direct and indirect stimuli | 362 |
| XXXIV.—ON PHOTONASTIC CURVATURES. | |
| Phototropic response of anisotropic organs—Positive para-heliotropism—Negative para-heliotropism—Responses of pulvinated and growing organs to light | 378 |
| XXXV.—EFFECT OF TEMPERATURE ON PHOTOTROPIC CURVATURE. | |
| Effect of temperature on excitability—Effect of temperature on conduction—Phototropic response of tendrils—Seasonal variation of phototropic curvature—Antagonistic effects of light and of rise of | |