32 RESPONSE IN THE LIVING AND NON-LIVING 



I. LEAF-STALK OF PLANE-TREE 

 The stimulus applied was a single vibration of 90. 



Mean response 23-6 



Mean 1 



Mean -15 



II. LEAF-STALK OF HORSE-CHESTNUT 



Mean 14 



Mean -3 



Mean 



These results conclusively prove the physiological 

 nature of the response. 



I shall in a succeeding chapter give a continuous 

 series of response-curves showing how, owing to pro- 

 gressive death from the action of poison, the responses 

 undergo steady diminution till they are completely 

 abolished. 



Effect of high temperature. It is well known that 

 plants are killed when subjected to high temperatures. 

 I took a stalk, and, using the block method, with torsional 



