The mechanistic conception of life : biological essays (1912)
Loeb, Jacques, 1859-1924 · Chicago, Ill. : University of Chicago Press · leaf 39
Fig. 18 … Fig. 19 Figs. 18 and 19.—Positive heliotropism of the polyps of Eudendrium. Thenew polyp-bearing stems all grow in the direction of the rays of light which isindicated by an arrow in each figure. (From nature.) These animals bend inthe same way to the light as the stems of positively heliotropic…
