Recueil des Travaux Botaniques Néerlandais, Vol. 5 Buchkatalog

Excerpt from Recueil des Travaux Botaniques Néerlandais, Vol. 5: Livraison 1Now it is very remarkable, that the nucellar tissue does not participate by cell division in this strong longitu dinal growth of the ovule. The portion of the nucellus, which projects beyond the inner integument, remains unaltered, except for certain changes, which the spore mother-cell undergoes, and which will be discussed below. We may however at once point out, that in the formation of embryo-sac and egg-cell, the whole apparatus remains in the same place, and is therefore never surrounded by the inner integument.The portion of the nucellus lying below this, is now elongated by the extreme stretching of a single cell (or in some cases perhaps two cells) in the central and in each of the 5, 6 or 7 peripheral rows of cells, of which it consists (fig. The nuclei often also assume an exten ded shape, so that one gets the impression that apassive stretching has taken place. At the same time a digestion of the longitudinal walls occurs, and finally the protoplasts also coalesce more or less. In this way a great cavity arises, containing prot-0plasm, often in a peripheral layer and with 6, 7 or 8 nuclei (fig. 12, 14), perhaps sometimes even more in consequence of nuclear fragmentation, which seems to occur.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.