href="@public@vhost@g@gutenberg@html@files@18986@[email protected]#CHAPTER_VIII" class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">CHAPTER VIII
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

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CHAPTER IX
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

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CHAPTER X
RESPONSE IN METALS

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

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CHAPTER XI
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

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CHAPTER XII
INORGANIC RESPONSE—METHOD OF ENSURING CONSISTENT RESULTS

Preparation of wire—Effect of single stimulus

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CHAPTER XIII
INORGANIC RESPONSE—MOLECULAR MOBILITY: ITS INFLUENCE ON RESPONSE

Effects of molecular inertia—Prolongation of period of recovery by overstrain—Molecular model—Reduction of molecular sluggishness attended by quickened recovery and heightened response—Effect of temperature—Modification of latent period and period of recovery by the action of chemical reagents—Diphasic variation

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CHAPTER XIV
INORGANIC RESPONSE—FATIGUE, STAIRCASE, AND MODIFIED RESPONSE

Fatigue in metals—Fatigue under continuous stimulation—Staircase effect—Reversed responses due to molecular modification in nerve and in metal, and their transformation into normal after continuous stimulation—Increased response after continuous stimulation

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CHAPTER XV
INORGANIC RESPONSE—RELATION BETWEEN STIMULUS AND RESPONSE—SUPERPOSITION OF STIMULI

Relation between stimulus and response—Magnetic analogue—Increase of response with increasing stimulus—Threshold of response—Superposition of stimuli—Hysteresis

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CHAPTER XVI
INORGANIC RESPONSE—EFFECT OF CHEMICAL REAGENTS

Action of chemical reagents—Action of stimulants on metals—Action of depressants on metals—Effect of ‘poisons’ on metals—Opposite effect of large and small doses

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CHAPTER XVII
ON THE STIMULUS OF LIGHT AND RETINAL CURRENTS

Visual impulse: (1) chemical theory; (2) electrical theory—Retinal currents—Normal response positive—Inorganic response under stimulus of light—Typical experiment on the electrical effect induced by light

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CHAPTER XVIII
INORGANIC RESPONSE—INFLUENCE OF VARIOUS CONDITIONS ON THE RESPONSE TO STIMULUS OF LIGHT

Effect of temperature—Effect of increasing length of exposure—Relation between intensity of light and magnitude of response—After-oscillation—Abnormal effects: (1) preliminary negative twitch; (2) reversal of response; (3) transient positive twitch on cessation of light; (4) decline and reversal—Résumé

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