Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 166
11:00 Fig. 23 11:00 4:55 P.M. 12:30 P.M 3:40 … 3:45Q /4:05 jr3:12 12:30—A-^—2iEM3;10 12:30 ^X 12:30 <- <- n Fig. 24 Fig. 22. Movement of Hydra viridis in total darkness, a, position at begin-ning of course, 8 a.m., yj; x, position at 8 a.m., y\; o, 9 a.m., y\; y, 8 a.m., y\.Fig. 23. Movement of the same specimens after exposure to light.…
Light -- Physiological effect · Phototropism
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