. The power of movement in plants . Plants; Botany. 232 CIECUMNUTATION OF LEAVES. Chap. I'V petiole very short. Fig. 97. Camellia Japonica: cir- cumnutation of leaf, traced from June 14th to 15th. Apex of leaf 12 inches from the ver- tical glass, so figure considerably mag- nified. Temp. Itj"- 16J° C. imicli movement could not be expected Nevertheless, the apex changed its course completely seven times in the course of 114 h., but moved to only a very small distance. On the next day the movement of the apex was traced during 26 h. 20 m. (as shown in Fig. 97), and was n
. The power of movement in plants . Plants; Botany. 232 CIECUMNUTATION OF LEAVES. Chap. I'V petiole very short. Fig. 97. Camellia Japonica: cir- cumnutation of leaf, traced from June 14th to 15th. Apex of leaf 12 inches from the ver- tical glass, so figure considerably mag- nified. Temp. Itj"- 16J° C. imicli movement could not be expected Nevertheless, the apex changed its course completely seven times in the course of 114 h., but moved to only a very small distance. On the next day the movement of the apex was traced during 26 h. 20 m. (as shown in Fig. 97), and was nearly of the same nature, but rather less complex. The movement seems to be periodical, for on both days the leaf circumnutated in the forenoon, fell in the afternoon (on the first day until between 3 and 4 , and on the second day until 6 ), and then rose, falling again during the night or early morning. In the chapter on the Sleep of Plants we shall see that the leaves in several Malvacoous genera sink Fig. 98. '. 30';h e'SO'*?'. tlD°.4S'., SO'^f' e'.so''r* M°.SS',^ Pelargonium zonale: circumnutation and downward movement of youLg leaf, traced from June 14th to 16th. Apex of leaf 9i inches from the vertical glass, so figure moderately magnifiedi Temp. 15°-16i° C. at night; ^nd as they often do not then occupy a vertical position, especially if they have not been well illuminated during. 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 Darwin, Charles, 1809-1882; Darwin, Francis, Sir, 1848-1925. New York : D. Appleton
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
