. Die Kraft der Bewegung in Pflanzen. Pflanzen, Botanik. 218 CIECUMNUTATION DES STOLONS. Chap-IV, an einem bewölkten Tag, wurde deutlich in Richtung des Lichts gekrümmt und waren daher heliotropic. Schließen Sie vor der Spitzen der ausgestreckten Ausläufer, waren eine Menge von sehr dünnen Sticks und die getrockneten haulms der Gräser in den Sand gefahren zu repräsentieren, die überfüllten Stämme der umliegenden Pflanzen in einem Zustand der Natur. Dies war für die Beobachtung, wie die wachsende Ausläufer durch sie führen würde. Sie taten so leicht im Laufe von 6 Tagen, und ihre circumnutation anscheinend erleichtert ihre Passage. Wenn

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. The power of movement in plants . Plants; Botany. 218 CIECUMNUTATION OF STOLONS. Chap IV, on a cloudy day, became distinctly curved towards the light, and were therefore heliotropic. Close in front of the tips of the prostrate stolons, a crowd of very thin sticks and the dried haulms of grasses were driven into the sand, to represent the crowded stems of surrounding plants in a state of nature. This was done for the sake of observing how the growing stolons would pass through them. They did so easily in the course of 6 days, and their circumnutation apparently facilitated their passage. When the tips encountered sticks so close together that they could not pass between them, they rose up and passed over them. The sticks and haulms were removed after the passage of the four stolons, two of which were found to have assumed a permanently sinuous shape, and two were sti'l straight. But to this subject we shall recur under Saxifraga. Saxifraya sarmentosa (Saxifrageae).—A plant in a suspended pot had emitted long branched stolons, which depended Uke Fig. 88.. Saxifraga sarmentosa: circumnutation of aa inclined stolon, traced in darkness on a horizontal glass, from 7.45 a.m. April 18th to 9 A.M. or 9th. Movement of end of stolon magnified 2-2 times. threads on all sides. Two were tied up so as to stand vertically, and their upper ends became gradually bent downwards, but so slowly in the course of several days, that the bending was pro- bably due to their weight and not to geotropism. A glass fila- ment with little triangles of paper was fixed to the end of one of these stolons, which was 17J inches in length, and had already become much bent down, but still projected at a considerable angle above the horizon. It moved only slightly three times from side to side and then upwards; on the following day. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati

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• bookcentury1800
• booksubjectbotany
• bookyear18
• bücherunterlage