Electro-Motive Wave accompanying Mechanical Disturbance in
Metals in contact with Electrolyte.' (_Proceedings Royal Society_,
vol. 70.)

'On the Strain Theory of Vision and of Photographic Action.' (_Journal
Royal Photographic Society_, vol. xxvi.)

These investigations were commenced in India, and I take this
opportunity to express my grateful acknowledgments to the Managers of
the Royal Institution, for the facilities offered me to complete them at
the Davy-Faraday Laboratory.

J. C. BOSE.

DAVY-FARADAY LABORATORY, ROYAL INSTITUTION,
LONDON: _May 1902._

CONTENTS

CHAPTER I

THE MECHANICAL RESPONSE OF LIVING SUBSTANCES
PAGE
Mechanical response--Different kinds of stimuli--Myograph
--Characteristics of response-curve: period, amplitude,
form--Modification of response-curves 1

CHAPTER II

ELECTRIC RESPONSE

Conditions for obtaining electric response--Method of
injury--Current of injury--Injured end, cuproid: uninjured,
zincoid--Current of response in nerve from more excited to
less excited--Difficulties of present nomenclature--Electric
recorder--Two types of response, positive and
negative--Universal applicability of electric mode of
response--Electric response a measure of physiological
activity--Electric response in plants 5

CHAPTER III

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

CHAPTER IV

ELECTRIC RESPONSE IN PLANTS--BLOCK METHOD

Method of block--Advantages of block method--Plant response a
physiological phenomenon--Abolition of response by
anaesthetics and poisons--Abolition of response when plant is
killed by hot water 27

CHAPTER V

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