. Die Kraft der Bewegung in Pflanzen. Pflanzen, Botanik. Kap. VUL HELIOTKOPISM. 421 Abb. 169. Nur etwas Zickzack. Obwohl es nicht einen einzigen eUipse sogar rund geformt wurde, die wir aus dem Zick-Zack-Linien-^ abgeleitet und, wie es bewiesen, korrekt -^, dass ihre hypocotyls circunmuta waren - Ting, für die am folgenden Tag diese Sämlinge in einem komplett abgedunkelten Raum platziert wurden, und jedes Mal wurden mit Hilfe einer kleinen Wachs Konus beobachtet fast direkt über ihnen, und ihre Bewegungen waren auf einer horizontalen Glas oben getastet; und jetzt ihre hypocotyls klar circum-Nutierten (Abb. 168 und 100 Kg. 39, für

• Bildanbieter: Central Historic Books / Alamy Stock Foto
• Bild-ID: PG1TCM
• Dateigröße: 7,2 MB (90,1 KB Komprimierter Download)
• Freigaben (Releases): Model - nein | Eigentum - nein
• Format: 851 x 2937 px | 7,2 x 24,9 cm | 2,8 x 9,8 inches | 300dpi

Weitere Informationen

Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.

Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel

. The power of movement in plants . Plants; Botany. Chap. VUL HELIOTKOPISM. 421 Fig. 169. only slightly zigzag. Although not a single eUipse was even approximately formed, we inferred from the zigzag lines—^and, as it proved, correctly—^that their hypocotyls were circunmuta- ting, for on the following day these same seedlings were placed in a completely darkened room, and were observed each time by the aid of a small wax taper held almost directly above them, and their movements were traced on a horizontal glass above; and now their hypocotyls clearly circum- nutated (Fig. 168, and Kg. 39, formerly given, p. 52); yet they moved a short distance towards the side where the taper was held np. If we look at these diagrams, and suppose that the taper had been held more on one side, and that the hypocotyls, stiU drcumnutating, had bent themselves within the same time much more towards the light, long zigzag lines would ob- viously have been the result. Again, two seedlings of Solanum lyco- psrsicum were illuminated from above, but accidentally a little more light entered on one than on any other side, and their hypocotyls became slightly bowed towards the brighter side; they moved in a zigzag line and described in their course two little triangles, as seen in Kg. 37 (p. 50), and in another tracing not given. The sheath- like cotyledons of Zea mays behaved, under nearly similar drcumstanc&s, in a nearly similar manner, as described in our first ^''^^^^"t and dr"m- chapter (p. 64), for they bowed themselves during the whole day towards one side, making, however, in their course some conspicuous flexures. Before we knew how greatly ordinary circumnutationwas modified by a lateral light, some seedling oats, with rather old and therefore not highly sensitive cotyledons, were placed in front of a north-east window, towards which they bent all day in a strongly zigzag course. On the following day they continued to bend in the same direction (Fig. 169), but zigz

Stockbilder mithilfe von Tags suchen

• bookcentury1800
• booksubjectbotany
• bookyear18
• bücherunterlage