Complexity of the problem--Effects of different forms of stimuli--Diverse responses under identical stimulus--Modification of response determined by intensity and point of application of stimulus, and tonic condition of organ--Response of pulvinated and growing organs--Necessity for shortening the period of experiment 1 Description of phenomenon--The Recording apparatus--Record of diurnal movement of the tree--Universality of tree movement--Cause of periodic movement--Periodic movement of trees, and diurnal variation of moto-excitability in _Mimosa pudica_--Relative effects of light and temperature--Physiological character of the movement--Transpiration and diurnal movement--Diurnal movemen…
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