RESPONSE OF PETIOLE-PULVINUS PREPARATION
77
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
