Page:Life Movements in Plants.djvu/107

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

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