Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 168
lture which was in strong diffuse light, put into somewater in a small rectangular aquai;ium and placed in totaldarkness without the temperatures being changed. Theysoon became attached to the bottom of the vessel in posi- MOVEMENT TOWARD LIGHT IN COELENTERATES 151 tions represented by dots (a) in… … ■<r-<-<- n Fig. 24 Fig. 22. Movement of Hydra viridis in total darkness, a, position at begin-ning of course, 8 a.m., jy; x, position at 8 a.m., j\; o, 9 a.m., IV; y, 8 a.m., y\.Fig. 23. Movement of the same specimens after exposure to light. 8 to 11 a.m., j\. Note that they have become…
Light -- Physiological effect · Phototropism
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