File:The cell; outlines of general anatomy and physiology (1895) (14597890990).jpg

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Identifier: celloutlinesofge00hert (find matches)
Title: The cell; outlines of general anatomy and physiology
Year: 1895 (1890s)
Authors: Hertwig, Oscar, 1849-1922 Campbell, Henry Johnstone, 1850-
Subjects:
Publisher: London, Sonnenschein
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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m ofthe cell. Sometimestwo nuclei are enclosedin one cell; these sub-sequently are eitherseparated from one another by a partition wall, or, as in Corydaliscava, fuse together to form a single cell. The sporangium of Saprolegnia is, to commence with, a longcell filled with protoplasm. Later on the nuclei in it increasevery much in number through bipartitions, which for the mostpart occur simultaneously. After a time they distribu te themselvesevenly throughout the cell-space. The protoplasm in the neigh-bourhood of each nucleus then differentiates itself into a smallmass, which surrounds itself with a firm glistening envelope;by this means the cell contents split up simultaneously into asmany spores as there are small nuclei present in the cell. Lateron these are passed to the exterior by the bursting of the mother-cell, the sporangium. The formation of swarm-spores in Ivadiolaria, which has beenalready mentioned, affords us another peculiar instance of so-called free cell-format ion.
Text Appearing After Image:
Fig. 124.—liesedo odorala. Protoplasmic lining ofthe embryo-sac at the commencement of free cell-formation, (x 240; after Strasburger, Botan. Pralcti-cum, Fig. 192.) THE VITAL PHENOMENA OF THE CELL 235 IV. Division with Reduction. During the final development of ova and spermatozoa, certainpeculiar processes of division occur, which have for their functionthe preparation of the sexual cells. The essential characteristic ofthis is, that in the double division that occurs the second followsthe first so quickly, that the nucleus has no time to enter the rest-ing condition. The result is, that the groups of nuclear segmentsproduced by the first division are immediately split up intotwo daughter-groups without previously undergoing longitudinalcleavage. Hence, at the end of the second division, the matureego;- and sperm-cells only contain half the number of nuclearsegments, and half as much nuclem substance, as are present inthe nuclei produced by ordinary cell division in the same anima

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  • bookid:celloutlinesofge00hert
  • bookyear:1895
  • bookdecade:1890
  • bookcentury:1800
  • bookauthor:Hertwig__Oscar__1849_1922
  • bookauthor:Campbell__Henry_Johnstone__1850_
  • bookpublisher:London__Sonnenschein
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:251
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
30 July 2014

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