Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 195
Fig. 27. The lines i, 2, etc., in ^, B, C, D, represent courses taken by fourdifferent blow-fly lar\ae in light of 78 ca. m. intensity, n, direction of horizontalrays from single Xernst glower. Orientation is not as accurate as one would ex-pect if light acts constantly as an orienting stimulus in…
Light -- Physiological effect · Phototropism
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