. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. tion is alwa^'S slightly cooler than the rest of the petiole, but upon the movement from irritation it rises in temperature; not enough, however, to account for the raising of so con- siderable a weight as that of the leaf. 1091. Some physiologists have regarded the sen- sitiveness of the pulviuus of the Sensitive plant and of other motile parts as residing chiefly if not whol- * 192 h" in the cell-wall, while others have thought that it resided in the con
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. tion is alwa^'S slightly cooler than the rest of the petiole, but upon the movement from irritation it rises in temperature; not enough, however, to account for the raising of so con- siderable a weight as that of the leaf. 1091. Some physiologists have regarded the sen- sitiveness of the pulviuus of the Sensitive plant and of other motile parts as residing chiefly if not whol- * 192 h" in the cell-wall, while others have thought that it resided in the contractile protoplasm. It is now generallj- held to be due to some sudden variation in the osmotic power of the proto- plasm, particularh' in its peripheral portion in contact with the cell-wall, by which the turgescence of the cell is suddenly changed.^ 1092. If a plant with motile leaves is kept in darkness for a day or so, even if the temperature is fav- orable to motion, its power of movement is either greatly impaired or for a time wholly lost. A dimiuislied amount of light is sufficient to produce the same effect in the case of the Sensitive plant. 1 Compare Hofineister : Die Lehre von der Pflanzenzelle, 1867, p. 300; Briicke : Archiv fiir Anatomie, Physiologie, mid wiss. Medicin, 1848, p. 434 ; Unger : Botanische Zeitung, 1862, p.' 113 ; 1863, p. 349. Fig. 192 TraiisversesectionofthemotileorganofaleiifletofOxaliscarnea. (Sachs.) Fio. 193. Vertical section tlirougli the niotilo organ of a leaflet of OxaliB carnea. ( 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 Goodale, George L. (George Lincoln), 1839-1923. New York [etc. ] : American Book Co.
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