CONTENTS 



PART I.— SIMPLE RESPONSE 

 CHAPTER I 



THE PLANT AS A MACHINE 



Responsive movements in plants— Work done by plant — Plant as a machine 

 • — Indicator-diagrams — Physiological response-curves — Pulse-records — 

 Cardiagrams — Modification of pulse by poison and other agencies — 

 Automatic response in plants — Optical Lever Recorder — Effect of 

 external agencies on automatic pulse-beat in plants .... 



CHAPTER n 



MECHANICAL RESPONSE TO STIMULUS 



Molecular derangement caused by stimukis — Expression in change of form, 

 contraction — Mechanical model — Myograph — Response by differential 

 contraction in pulvinated plant-organs — Longitudinal response in plants 

 — Response of plant to all forms of stimulus — Plant chamber — I'ractic- 

 able forms of graduated stimulus — Electro-thermic stimulator — Stimula- 

 tion by condenser discharge — Response-recorder — Advantage of counter- 

 poise — Response of Biophytitvi to thermal stimulation — Response to 

 condenser discharge — Absolute measurements of motile effect and of 

 work performed — Effect of load — Definite determination of threshold of 

 response — Determination of variation of excitability by measurement 

 of minimally effective stimulus ........ 



CHAPTER HI 



ON THE UNIVERSALITY OF SENSITIVENESS IN PLANTS 

 AS DEMONSTRATED 15V MEANS OF ELECTRICAL RESPONSE 



Arbitrary classification of plants into sensitive and ordinary — Method of 

 electro-motive variation for detecting state of excitation — Hydraulic 

 model — Excitation of vegetable tissue, like that of animal tissue, induces 

 galvanometric negativity — Methods of direct and transmitted excitation 

 — Electrical and mechanical response alike record molecular derange- 

 ment and recovery — Similarities in simultaneous record of mechanical 



