Page:Collected Physical Papers.djvu/342

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122
QUADRANT METHOD OF RESPONSE

multiple. The following table shows the parallel effects exhibited by diverse modes of response.

Table showing parallelism in different modes of response

External change Mechanical response Variation of growth Electro-motive response Resistivity variation
Sub-minimal stimulus Expansion; erectile response Acceleration of growth Galvanometric positivity Increase of resistance
Moderate stimulus Contraction and fall of leaf Retardation of growth Galvanometric negativity Diminution of resistance
Strong stimulus Multiple response Multiple response Multiple response Multiple response
Depressants Diminished response Retardation of growth Diminished response Diminished response
Stimulating agents Enhanced response Acceleration of growth Enhanced response Enhanced response

(Life Movements in Plants, Vol. IV, 1923.)