American journal of physiology . iere. , 1892. Loeb: On some facts and principles of physiological morphology. WoodsHole biological lectures, 1893. ^ Bickford, E. : Notes on regeneration and heteromorphosis of Tubularianhydroids. Journal of morphology, 1894, ix, p. 417. * Driesch, H. : Zur Analyse der Reparationsbedingungen bei der Naturforscher-Gesellschaft. Zurich, 1896. 62 Jacques Loeb. Last summer I had an opportunity to observe directly the trans-formation of organs under the influence of contact. My observationswere made at Woods Hole on a transpa
American journal of physiology . iere. , 1892. Loeb: On some facts and principles of physiological morphology. WoodsHole biological lectures, 1893. ^ Bickford, E. : Notes on regeneration and heteromorphosis of Tubularianhydroids. Journal of morphology, 1894, ix, p. 417. * Driesch, H. : Zur Analyse der Reparationsbedingungen bei der Naturforscher-Gesellschaft. Zurich, 1896. 62 Jacques Loeb. Last summer I had an opportunity to observe directly the trans-formation of organs under the influence of contact. My observationswere made at Woods Hole on a transparent hydroid, hydroid attaches itself with stolons to solid bodies. The stemwith the polyps grows at right angles with the solid body to which itsstolons are attached. If these Campanulariae be cultivated on a ver-tical wall all the stems assume an exactly horizontal position in thewater. The stem of a Campanularia is the most perfect specimen fornegative stereotropism I have ever observed. If a stem be cut off. a--. and put on the bottom of a watch glass filled with sea-water, all thepolyps that touch the glass are transformed into the material of thestem. This material creeps out of the stem, forming stolons whereverit comes in contact with the glass, giving rise to polyps on its uppersurface which is in contact with sea-water. The polyps continuegrowing at right angles toward the bottom of the dish. All theseprocesses may occur in less than a day, and can be observed directlywith a lens. I will try to give a description of these phenomena withthe aid of camera drawings I made while observingf them. Fiij. i On the Transformation and Regeneration of Organs. 63
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