Outlines of human physiology . e leaves is permanent; and no sensible mo-tion follows any kind of excitement, that may be em-ployed. When the plant is healthy, on the contrary, it Of the Motion of the Sensitive Plant. 13 is difficult to approach it without causing several ofthe leaves to fall. If the plant be shaken, all drop atonce at their joints; at the same time the leaflets ap-proach each other, and the sub-leaflets become folded in pairs, ^i-. the manner represented inKg. 2. \t| If the stimulus applied bepartial; if, for instance, it con-sist in cutting a single sub-leaflet, that
Outlines of human physiology . e leaves is permanent; and no sensible mo-tion follows any kind of excitement, that may be em-ployed. When the plant is healthy, on the contrary, it Of the Motion of the Sensitive Plant. 13 is difficult to approach it without causing several ofthe leaves to fall. If the plant be shaken, all drop atonce at their joints; at the same time the leaflets ap-proach each other, and the sub-leaflets become folded in pairs, ^i-. the manner represented inKg. 2. \t| If the stimulus applied bepartial; if, for instance, it con-sist in cutting a single sub-leaflet, that sub-leaflet instantlyrises with its fellow^; then thenext pair, and so on in succes-sion, till all upon the same leaf-let are folded : the petiole thendrops at its joint; and after-wards, all its remaining leafletsclose. If a sub-leaflet have beenburnt, the excitement extendsfrom one leaf to those adjoining;or if applied to the stem, or tothe flower, which in themselveshave no motion, it may thencebe propagated to the Three circumstances in these phenomena deserve tobe particularly remarked. 1. The motion, which takes place at the articulation,is produced by an excess of force, not on the sidetowards which the leaf is bent, but on the is proved by cutting a notch in the intumescence 14 Of the Motion of the Sensitive Plant. of the joint; upon which the leaf-stalk becomes per-mamntly bent towards the wounded side»
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