10 RESEARCHES ON IRRITABILITY OF PLANTS 



intensity of reply measures the physiological efficiency of 

 the plant tissue for the time being. 



Automatic records of mechanical and electrical responses 

 of plant can be obtained with suitable apparatus. 



For recording the mechanical responses of Mimosa and 

 other sensitive plants, a writing-lever is employed. Distor- 

 tion of record by friction is apt to introduce error, which 

 has to be eliminated. 



