ELECTRIC RESPONSE IN PLANTS--METHOD OF NEGATIVE VARIATION
Negative variation--Response recorder--Photographic recorder--Compensator--Means of graduating intensity of stimulus--Spring-tapper and torsional vibrator--Intensity of stimulus dependent on amplitude of vibration--Effectiveness of stimulus dependent on rapidity also 17
ELECTRIC RESPONSE IN PLANTS--BLOCK METHOD
Method of block--Advantages of block method--Plant response a physiological phenomenon--Abolition of response by anæsthetics and poisons--Abolition of response when plant is killed by hot water 27
PLANT RESPONSE--ON THE EFFECTS OF SINGLE STIMULUS AND OF SUPERPOSED STIMULI
Effect of single stimulus--Superposition of stimuli--Additive effect--Staircase effect--Fatigue--No fatigue when sufficient interval between stimuli--Apparent fatigue when stimulation frequency is increased--Fatigue under continuous stimulation 35
Diphasic variation--Positive after-effect and positive response--Radial E.M. variation 44
PLANT RESPONSE--ON THE RELATION BETWEEN STIMULUS AND RESPONSE
Increased response with increasing stimulus--Apparent diminution of response with excessively strong stimulus 51
PLANT RESPONSE--ON THE INFLUENCE OF TEMPERATURE
Effect of very low temperature--Influence of high temperature--Determination of death-point--Increased response as after-effect of temperature variation--Death of plant and abolition of response by the action of steam 59
PLANT RESPONSE--EFFECT OF ANÆSTHETICS AND POISONS
Effect of anæsthetics, a test of vital character of response--Effect of chloroform--Effect of chloral--Effect of formalin--Method in which response is unaffected by variation of resistance--Advantage of block method--Effect of dose 71
Is response found in inorganic substances?--Experiment on tin, block method--Anomalies of existing terminology--Response by method of depression--Response by method of exaltation 81
INORGANIC RESPONSE--MODIFIED APPARATUS TO EXHIBIT RESPONSE IN METALS
Conditions of obtaining quantitative measurements--Modification of the block method--Vibration cell--Application of stimulus--Graduation of the intensity of stimulus--Considerations showing that electric response is due to molecular disturbance--Test experiment--Molecular voltaic cell 91