Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 82
13 12 … Fig. 5. Tracings of shadow of a plumule of corn showing its reaction in light ofgraded intensity, three-fourths natural size. I. Cross section of two beams oflight as used in the experiment; intensity at a and a, zero; at b and b, 100 ca. m.;I, 2, 3, 4, 5, 6, 7, successive positions of plumule at…
Light -- Physiological effect · Phototropism
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