Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 92
such a position that the edge was in line with the shadowof the plumule cast on a white surface temporarily arrangedfor the purpose (Fig. 6). The intensity of light to which the plumules were ex-posed varied from about 2 to 14 ca. m. In most of theexperiments they were exposed to the lowest… … Fig. 6. A-E. Courses taken by tips of plumules in bending toward the glowerin a graded beam of light; magnified five times. The dots represent the positionat time indicated. The large arrows indicate direction of rays; the small ones thedirection of movement of plumules; d, side of the beam havjng…
Light · Phototropism
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