Page:Life Movements in Plants.djvu/107

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RESPONSE OF PETIOLE-PULVINUS PREPARATION

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hydrostatic pressure maintains the specimen in a moderately turgid condition. A preparation thus made is

Fig. 30—The Resonant Recorder, with petiole-pulvinus preparation. (From a photograph.)

insensitive at the beginning, but if left undisturbed it slowly recovers its excitability. The history of the depression of excitability after shock of preparation and its

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