On the Electromotive Properties of the Leaf of Dionaea in the Excited and Unexcited StatesSecond Paper . 7 to 0, or {0*5, andthe prevailing direction of the excitatory effect became \ ; so that in every respect butone, the curves are seen to be counterparts of each other. Both effects began in the 438 PROFESSOR J. B. SANDERSON ON THE ELECTROMOTIVE same direction, but in the modified preparation the initial negative phase, which beforemodification is interrupted or cut short by an effect in the opposite direction, rose toits highest point at about - the same time after excitation as the positiv
On the Electromotive Properties of the Leaf of Dionaea in the Excited and Unexcited StatesSecond Paper . 7 to 0, or {0*5, andthe prevailing direction of the excitatory effect became \ ; so that in every respect butone, the curves are seen to be counterparts of each other. Both effects began in the 438 PROFESSOR J. B. SANDERSON ON THE ELECTROMOTIVE same direction, but in the modified preparation the initial negative phase, which beforemodification is interrupted or cut short by an effect in the opposite direction, rose toits highest point at about - the same time after excitation as the positive phase hadculminated before. In both conditions there was an after effect, but the two after Diagram effects had opposite signs. In the unmodified state the under surface became morenegative as a consequence of each excitation ; after modification it became morepositive. The diminutionof resistance was as great as in the other cases. Withequal lengths of wire the deflection before modification was 160 ; after, 110 X 10. Experiment Aug. 17 (diagram 5).—In preparation IV. the difference was61, but, as in Experiments I. and II, diminished considerably before the rheotomeobservation could be taken. For the purpose of bringing about modification, thecurrent of two Callaud cells was passed through the right lobe for one minute,changing the direction every ten seconds. One such operation failed to produce thedesired result, the difference remaining in the old direction ; but after a second Diagram 5. - v ? : • • ? - *V*r--- ~-•..;, t;o! - • ? - r \ rt u >—^H i -45 ] ! | i ! M ! ; ! I 2_ \ - ;....;..:...i ; 10, ; ; ; : ? ; ! i , ...;.. ,i . i 1 f!.r/,.j<
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