CONTENTS 



CHAPTER I 



PLANT SCRIPTS 



Action of environment on plant — Revelation of internal condition ^ 

 by character of response — Problems to be solved — Electrical | 

 response — Mechanical • response — Motile organ in Mimosa '> 

 pudica — Response in plant and animal — Different phases 

 of the responsive movement — Graphic record — Determination ! 

 of absolute movement of leaf and its time-relations — * 

 Characteristic effects of different agencies on the response- 

 curve — Specific difficulties in recording plant-response . i \ 



CHAPTER II ] 



THE RESONANT RECORDER i 



Advantages of intermittent contact in record — Two types of ■] 

 apparatus : the Oscillating Recorder, and the Resonant 

 Recorder — Coercer and Vibrator — Perfect tuning — Recorders 



with standardised frequencies — Slide and clockwork — The i 

 record its own chronogram — Smoked surface and its fixation — 



Adjustments of the writer — Records with continuous and 'i 



intermittent contacts ....... ii j 



j 



CHAPTER III ] 



■\ 



METHODS OF STIMULATION \ 



Different methods of stimulating the plant : mechanical, chemical, | 



thermal and electrical — Difficulties of securing quantitative ; 



stimuli — Direct and indirect stimulation — Ideal modes of I 

 stimulation — Electro-thermic stimulation — Stimulation by 

 constant current — Stimulation by condenser-discharge — Non- 



polarisable electrodes — Direct, extra-electrodal, and intra- ■ 



electrodal stimulation — Stimulation by induction-shock — : 

 Effects of make- and break-shock — Excitation by tetanising 



shock .......... 23 \ 



xi 



b a J 



