Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 219
scussion. — It has already been demonstrated thatneither the direction of the rays through the organism, inaccord with Sachs theory, nor the angle between the raysand the sensitive surface, in accord with Loebs^ explana-tion, is of importance in explaining the orienting reactionsof the fly larvae.…
Light · Phototropism
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