. The power of movement in plants. Plants; Botany. 24 CIECUMNUTATION OF SEEDLINGS. Chap. 1. In Fig. 13 ils course is shown from on June 17th, to on the following morn- ing ; and we see that during tho daytime, in the course of 11 h. 15 m., it travelled thrice dowji and twice up. After it moved rapidly downwards, and in an hour or two depended verti- cally ; it thus remained all night asleep. This position could not be represented on the vertical glass nor in the figure here given. By on the following morning (18th) both cotyledons had risen greatly, and
. The power of movement in plants. Plants; Botany. 24 CIECUMNUTATION OF SEEDLINGS. Chap. 1. In Fig. 13 ils course is shown from on June 17th, to on the following morn- ing ; and we see that during tho daytime, in the course of 11 h. 15 m., it travelled thrice dowji and twice up. After it moved rapidly downwards, and in an hour or two depended verti- cally ; it thus remained all night asleep. This position could not be represented on the vertical glass nor in the figure here given. By on the following morning (18th) both cotyledons had risen greatly, and they con- tinued to rise until 8 , when they stood almost horizontally. Their movement was traced dur- ing the whole of this day and until the next morning; but a tracing is not given, as it was closely similar to Fig. 13, except- ing that the Unes were more zigzag. The cotyledons moved 7 times, either upwards or down- wards; and at about 4 the great nocturnal sinking move- ment commenced. Another seedling was observed in a similar manner during nearly 24 h., but with the difference that the hypocotyl was left free. The movement also was less magnified. Between and 5 on the 18th, the apex of the cotyle- don moved 7 times upwards or downwards (Fig. 14). The noc- turnal sinking movement, which is merely a great increase of one of the diurnal oscillations, com- menced about 4 Oxalk Va!diviana.—l\\is species is interesting, as the coty-. 8°30^ u Oxalis rosea: circuninutation of cotyledons, the hypocotyl being secured to a stick; illumina- ted from above. Figure here given one-harf of original 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, Appleton
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