The Journal of Experimental Zoölogy, 1909, Vol. 7 (Classic Reprint)

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Excerpt from The Journal of Experimental Zoölogy, 1909, Vol. 7The axial relations assumed by the new head in reference to the common foot were not constant for even the same hydra at di¿'er ent times. The new head was sometimes at right angles to the stock hydra, it sometimes formed a right angle with the foot and a straight line with the original head, it sometimes formed an obtuse angle with the foot making a Y - shaped structure, and it was some times at an acute angle with the foot forming a A - shaped ngure. The new hydranth never showed any tendency to travel toward the aboral end of the stock hydra. This is of interest in connection with Miss King's experiments in grafting whole heads into the side of stock hydras. As a result of her work, she found that the graft either separated from the stock in from I4. To 22 days, or migrated toward the foot region and separated in from 5 to 7 weeks. These two modes of separation are due, she concludes from her experiments, to the axial relations assumed by the components of the graft. If the graft remains at right angles to the trunk, separation takes place without migration, if the graft forms a Y - shaped structure with the stock, it migrates toward the aboral end before separating. The new hydranth that is formed in my experiment seems to act quite difierently. It has no definite axial relations with the stock and does not migrate toward the foot. As to the final separation of the regenerated hydranth from the old stock, I can say nothing, for I have not succeeded in keeping these grafts more than a month after operation, and they have not separated within that time.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.