The mechanistic conception of life : biological essays (1912)
Loeb, Jacques, 1859-1924 · Chicago, Ill. : University of Chicago Press · leaf 101
end of a stem may continue togrow as a totally different organ, namely, as a root. Everyorgan not in contact with some solid body gives rise to polyps.Even the main root, if not in contact with a solid body, no longergrows as a root, but gives rise to a great number of small polypswhich appear at… … Fig. 27.—Heteromorphosis in Margelis, a hydroid. At a and 6, where thepoints of stems touch the ground of the aquarium, new roots or stolons grow out. The stem touched the bottom of the dish with the apical ends,a and h. All these ends gave rise to roots. From the upperside of the original root,…
