Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 95
eaves in graded light. DifTerentparts of the leaf blades were thus subjected to differentintensities. In some experiments one-half of the blade wasentirely in the shadow. I was unable to detect any influ-ence of the unequal illumination of the blade on orientation.The leaves turned toward the… … n n 1 if^ *-^ p.. s-\ ^. «i ii « 0 n »--■r \ ■ 1--^ 1 FiO. 7. il-D. Courses taken by tips of plumules of Indian com (Zea mays) asviewed from above in a beam of graded light (a) which was reflected from themirror m so as to illuminate the two surfaces equally. Magnified five times. Thearrows (a)…
Light · Phototropism
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