About This Book
The author presents experimental analyses of plant movements, describing sensitive instruments for recording minute growth and electrical responses and using them to dissect tropisms, nastic reactions, tendril twining, thermonasty and phototropism. He distinguishes direct versus indirect stimulation and shows how these modes produce opposite growth effects, relates curvature to light intensity and duration, and documents responses to broader electromagnetic stimuli. Electrical probing and geo-electric tests localize perceptive tissues and reveal dual impulse patterns. Results are synthesized into general laws linking turgor and growth-rate changes to environmental cues and highlighting physiological continuity between plant and animal excitability.
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