Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 177
11.-00 J1%0 MM PI«.M … Fig. 24 Fig. 32. Movement of Hydra viridis in total darkness, a, position at begin-ning of course, 8 A.si., -fj-; x, position at 8 a.m., -j^i; o, 9 a.m., iV; y, 8 a.m., -ff.Fig. 23. Movement of the same specimens after exposure to light. 8 to 11 A.M., -ff. Note that they have bwome much more…
Light · Phototropism
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