Page:Collected Physical Papers.djvu/16

page Bridge—Automatic keys—The Galvanograph—Radiograph of variation of intensity of light for 12 hours in winter—Record of diurnal variation of light and temperature in summer—Light noon and thermal noon •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

338

(Life Movements in Plants, 1923.)

XXVI

THE HIGH MAGNIFICATION CRESCOGRAPH

Record by the Crescograph—Determination of the absolute rate of growth—Effect of chemical reagents—The Balanced Crescograph—Wireless stimulation and growth—Effects of feeble and of strong stimulation •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

347

(Proc. Roy. Soc. October 1917.)

XXVII

THE MAGNETIC CRESCOGRAPH AND THE MAGNETIC RADIOMETER

Magnification of fifty million times by the Magnetic Crescograph—Demonstration of effects of variation of temperature and of chemical reagents on growth by the Magnetic Crescograph—The Magnetic Radiometer—Discrimination of radiation components in the solar spectrum in the morning and at midday—Comparison of energy of different rays in the solar spectrum •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

357

(Physiology of Photosynthesis 1925.)

XXVIII

THE RESONANT RECORDER

Accurate record of extremely short intervals of time—Principle of resonance—Determination of the latent period—Measurement of velocity of transmission of excitation in Mimosa pudica—Effect of variation of temperature on the velocity—Nervous impulse in animal and plant—Contractility, Conductivity and Rhythmicity—The Resonant Cardiograph—Characteristic cardiograms of tortoise, frog and fish—Effects of depressant and stimulant on cardiac pulsation—Stimulation and depression of autonomous pulsations of Desmodium gyrans •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

364

(Phil. Trans. 1912; Irritability of Plants 1913.)

XXIX

General Summary •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

374