Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 166
ecimens in which this upward swimming is just suffi- I40 LIGHT AND THE BEHAVIOR OP ORGANISMS cient to overcome the effect of gravity, and under such con-ditions they appear to be hanging in the water motionless.They are, however, rotating on their longitudinal axes. Wnow the light intensity, to… … Fig. 20. Diagram representing the reaction of a Volvox colony when the Ughtintensity is suddenly changed, a, outline of colony; 6, longitudinal axis; ci lightrays; d, point in the course where the light is suddenly decreased; r, point whereit is suddenly increased; /, course taken by colony. In…
Light · Phototropism
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