CONTENTS
xiii
depressing, and toxic agents—Phenomenon of accommodation—Stimulating action of ozone—Effects of carbonic-acid gas, vapour of alcohol, ether, carbon disulphide, coal gas, chloroform, ammonia, sulphuretted hydrogen, laughing-gas, nitrogen dioxide, and sulphur dioxide • • • • • • • • • • • • • • • • • • • • • • • • • • • • |
85 |
DEATH-SPASM IN PLANTS
Criterion of the death of plant—Abolition of electric response at death—Mechanical spasm of death—Water-bath for uniform rise of temperature—Excitatory effect of sudden cooling or heating—Erection of leaf with rising, and depression of leaf with falling, temperature—Thermo-mechanical inversion at the death-point—Necessity for specification of rate of rise of temperature—Death-record of Mimosa—Abolition
of response after death-spasm—Constancy of death-point exhibited by different specimens—Death-records of Desmodium gyrans and Vicia Fava—Death-spasm in ordinary plants—The electric-spasm of death—Lowering of death-point by fatigue and by poisonous solution • • • • • • • • • • • • • • • • • • • • • • • • • • • • |
98 |
DETERMINATION OF THE LATENT PERIOD
Difficulties of accurate determination of Latent Period—Advantages of Resonant Recorder—Simultaneous tracings of tuning-fork exciter and Resonant Recorder—Automatic stimulation at a definite moment—Identical value of latent period in successive determinations—Accurate measurement of time-interval shorter than .005 second—Latent period little affected by inertia of recorder—Tabular statement of value of different specimens of Mimosa—Effect of season on latent period • • • • • • • • • • • • • • • • • • • • • • • • • • • • |
108 |
INFLUENCE OF INTENSITY OF STIMULUS, FATIGUE, AND TEMPERATURE ON THE LATENT PERIOD
Diffuse stimulation under alternating-shock—Effect of intensity of stimulus on Latent Period—Influence of optimum condition—Effect of fatigue—Effect of temperature • • • • • • • • • • • • • • • • • • • • • • • • • • • • |
122 |
