Biological Bulletin, Vol. 28
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| Hersteller: | Forgotten Books (Lillie, Frank R.) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from Biological Bulletin, Vol. 28: Of the Marine Biological Laboratory, Woods Hole; Mass If any apology be needed for merely adding to the long list of eggs susceptible to agents of artificial parthenogenesis it may be suggested that initiation of development in annelids possesses some interest since annelid ova respond only with difficulty to agents that induce development. We need but recall the case of Chætopterus (Loeb, ´01b, Lillie ´02, Allyn), of Amphitrite (Loeb, ´01a, Scott), of Podarke (Treadwell), of the Pacific Nerets (Loeb, ´13), of Polynoe (Loeb, ´07, ´08) and of Nereis limbata (Fischer, Lillie, ´11, Loeb, ´12b, ´13) to justify this statement. In all these eggs differentiation without cleavage is far easier to obtain than development closely simulating the normal. Among diverse agents few only will give cleavage in Chcetopterus (Allyn, Loeb and Wasteneys). The case of Thalassema stands almost alone among annelids in giving development which is, according to Lefevre, to a surprising degree like the normal. Another instance among annelids of differentiation with cleavage artificially induced is worthy of note. This report, however, on the initiation of development in Nereis by heat has, I think, special significance. The results here offered require an interpretation which concerns the fundamental theory of parthenogenesis and fertilization. Experimental. Certain preliminary experiments date from 1913. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.
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