. An introduction to vegetable physiology. Plant physiology. STIMULATION AND ITS EESULTS 375 That these movements are essentially dependent on the power of the protoplasm to receive impressions from without, or in other words upon its possession of tone, can be seen from a study of the conditions under which they are performed. When the soil is too dry, or when from any other cause the protoplasm in the cells is not supplied. Fig. 155.—Pulvinus of Mimosa, b, the succulent parenchyma of its upper and lower sides; c, bud; dt parenchyma of Rachis; e, pith. with water in sufficient quantity, they
. An introduction to vegetable physiology. Plant physiology. STIMULATION AND ITS EESULTS 375 That these movements are essentially dependent on the power of the protoplasm to receive impressions from without, or in other words upon its possession of tone, can be seen from a study of the conditions under which they are performed. When the soil is too dry, or when from any other cause the protoplasm in the cells is not supplied. Fig. 155.—Pulvinus of Mimosa, b, the succulent parenchyma of its upper and lower sides; c, bud; dt parenchyma of Rachis; e, pith. with water in sufficient quantity, they cease. When the temperature is too low they are interfered with. Violent disturbance of the protoplasm by shaking the plant will in some cases prevent their occurrence for one or two nights. The purpose of the movement is somewhat obscure ; it. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Green, J. Reynolds (Joseph Reynolds), 1848-1914. Philadelphia, P. Blakiston
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