204 



COMPARATIVE ELECTRO-PHYSIOLOGY 



Amaranth, and abolished the excitability of one of the two 

 contacts a lateral leaf by scalding. The electrical curve, 

 under a continuously rising temperature, was now taken in 

 the usual manner. The existing electro-motive difference 

 between living and injured contacts underwent the usual 



59 



\ 55 



M I . 



\ ! 58 



57" 



FIG. 134. Record showing Inversion of Electric Curve (represented 

 by dotted line) and Simultaneous Reversal of Electric Response in 

 Stem of Amaranth 



\ indicates current of injury from injured to uninjured contact, which, 

 reaching a maximum, undergoes reversal at death-point. Normal 

 response up, also becomes reversed to down after death-point. 



increase, reaching a maximum at the death-point. Meanwhile 

 electrical responses to uniform vibrational stimuli were taken 

 at intervals a few degrees apart. It will be seen (fig. 134) 

 that the electrical inversion took place at 57 C, this 

 moderate lowering of the death-point being due, in all 

 probability, to the slight depression caused by scalding at 



