his I shall describe a simple method which I have devised for demonstrating the principal results.
CONTROL OF TRANSMITTED EXCITATION IN AVERRUOA HIIAMHI.
The petiole of Averrhoa hilimhi has a large number of paired leaflets, which, on excitation, undergo downward closure. Feeble stimulus is applied at a point in the petiole, and the transmission of excitation is visibly mani- fested by the serial fall of the leaflets. The distance to which the excitation reaches is a measure of normal power of contluction. Any variation of conductivity, by the passage of an electric current in one direction or the other is detected by the enhancement or diminution of the dis- tance through which excitation is transmitted. I shall describe the special precautions to be taken in carrying oat this investigation.
Electric stimulus of induction shock of definite intensity and duration is supplied at the middle of the petiole at EE' (Fig. 44j. The leaflets to the left of E, are not necessary
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Fig. 44._Diagram of experimental arrangement for control of transmitted escit- ation in Averrhoa bilimbi. For explanation see text.
