. The dynamics of living matter . Figs. 20, 21. — Positive heliotropism of the polyps of Eudendrium. The new polyp-bearing stems all grow in the direction of the rays of light which is indicated by an arrow in each figure. (From nature.) after the curvature occurs, the stem turns and bends in the opposite direction.* Sachs mentions that in the stems of plants also the heho- tropic curvature can be again reversed, provided the experimenter does not wait until the bent region of the stem has become too hard. The hehotropic curvature in Eudendrium is therefore a phenomenon of contractihty and not
. The dynamics of living matter . Figs. 20, 21. — Positive heliotropism of the polyps of Eudendrium. The new polyp-bearing stems all grow in the direction of the rays of light which is indicated by an arrow in each figure. (From nature.) after the curvature occurs, the stem turns and bends in the opposite direction.* Sachs mentions that in the stems of plants also the heho- tropic curvature can be again reversed, provided the experimenter does not wait until the bent region of the stem has become too hard. The hehotropic curvature in Eudendrium is therefore a phenomenon of contractihty and not a phenomenon of growth, although growth may accidentally occur at the same time. * These observations were made in 1895 ^'^ Woods Hole, and were mentioned briefly in Pfluger''s Archiv, Vol. 63, p. 273, 1895.
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