150 RESEARCHES ON IRRITABILITY OF PLANTS 



transmission of excitation. Hence if, in tHe results of the 

 last experiment, we make the small corrections representing 

 the variations of the latent period, the velocity of trans- 

 mission at 22° C. will be found to be 3*6 mm. per second, 

 at 28° C. it is increased to 6-3 mm. per second ; and at 

 31° C. it has become 9 mm. per second. Thus at 31° C. it 

 is two and a half times as great as the velocity at 22° C. 



The results of this and a few of many other experi- 

 ments on the influence of temperature on velocity are given 

 in the following table. It need only be said that the effect 

 of rising temperature was always to induce an increase in the 

 velocity of transmission. 



Effect of Temperature on Velocity of Transmission. 



Velocity of Transmission in Biophytum and Averrhoa 



Employing the method that has been described I have 

 determined the velocity of transmission of impulse in the 



