ELECTRICAL PHENOMENA AND METABOLISM OF ARUM SPADICES. 475 



PLATE IV. 



ri- 



fi 



-z>' (D 



/o<S 



c 



tO 



o 



■^S 



M 



/s 



M. 



3^^' 



Experiment A.—Fca seedling (November 28, 1907). Diphasic and mocophasic 

 responses to two successive excitations by heated platinum loop of wire. 



Distance between leading-oif electrodes equals about I'o cm., and the 



same 



distance between excited and led-ofl: regions. 



Deflections at beginning and end of experiment are by ^-i^ volt. 



PLATE V. 



1 



/Q 



-A: 



Itr 



"Xci 



Experiment Z.—Pea seedling (November 28. 1907) Doubtful diphasic response 



to thermic excitation. 



