CONTENTS 



PART L— SIMPLE RESPONSE 

 CHAPTER I 



THE PLANT AS A MACHINE 



I'AGE 



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 i 



CHAPTER II 



MECHANICAL RESPONSE TO STIMULUS 



Molecular derangement caused by stimulus — 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 — Practic- 

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

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

 poise — Response of BiophyUtm 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 . . . . . . . .10 



CHAPTER III 



ON THE UNIVERSALITY OF SENSITIVENESS IN PLANTS 

 AS DEMONSTRATED BY 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 



