. The power of movement in plants . Plants; Botany. 68 CmCUMNUTATION OF SEEDLINGS. Chap I. Cycaspectinata (Cycadese).—The large seeds of this plant in germinating first protrude a single leaf, which breaks through the ground with the petiole bowed into an arch and with the leaflets involuted. A leaf in this condition, which at the close of our observations was 2i inches in height, had its movements traced in a warm greenhouse by means of a glass filament bearing paper trangles attached across its tip. The tracing (Fig. 45) si.ows bow large, complex, and rapid were the circum- Fig. 45.. Oycas p
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. The power of movement in plants . Plants; Botany. 68 CmCUMNUTATION OF SEEDLINGS. Chap I. Cycaspectinata (Cycadese).—The large seeds of this plant in germinating first protrude a single leaf, which breaks through the ground with the petiole bowed into an arch and with the leaflets involuted. A leaf in this condition, which at the close of our observations was 2i inches in height, had its movements traced in a warm greenhouse by means of a glass filament bearing paper trangles attached across its tip. The tracing (Fig. 45) si.ows bow large, complex, and rapid were the circum- Fig. 45.. Oycas peatinata: circumnutatlon of young leaf whilst emerging from the ground, feebly illuminated from above, traced on vertical glass, from 5 P.M. May 28th to 11 A.M. 31st. Movement magniiied 7 times, here reduced to two-thirds of original scale. nutating movements. The extreme distance from side to side which it passed over amounted to between '6 and '7 of an inch. (Janna Warscewiczii (Cannacese).—A seedling with the plu- mule projecting one inch above the ground was observed, but not under fair conditions, as it was brought out of the hot- house and kept in a room not sufficiently warm. Nevertheless the tracing (Fig. 46) shows that it made two or three incom- plete irregular circles or ellipses in the course of 48 hours. The plumule is straight; and this was the first instance observed. 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 work.. Darwin, Charles, 1809-1882; Darwin, Francis, Sir, 1848-1925. New York : D. Appleton