Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 79
9:15 A.M. 10:00 10:40 … 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 having…
Light -- Physiological effect · Phototropism
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