Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 164
11:00 11:00 Fig. 23 4:55 P.M. A12:30*P.M. … D. 12:30 • 12:30 n Fig. 24 FIG. 22. Movement of Hydra viridis in total darkness, a, position at begin-ning of course, 8 A.M., T4T; x, position at 8 A.M., T42; o, 9 A.M., ^j y, 8 A.M., T4T.FIG. 23. Movement of the same specimens after exposure to light. 8 to 11 A.M., T\. Note that they have become…
Light -- Physiological effect · Phototropism
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