File:The American Museum journal (c1900-(1918)) (17971842970).jpg

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Title: The American Museum journal
Identifier: americanmuseumjo06amer (find matches)
Year: c1900-(1918) (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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THE DEVELOPMENT OE A MOLLUSK 37 still farther separated, the radiations become more distinct, and soon seem to act on the chromosomes as two sets of fibers. The next step is a separation of every chromosome into two parts, which seem to be drawn in opposite directions toward the two centrosomes. These changes are shown in Model 2 and Fig. C. In this manner two new nuclei are formed from the pronuclei, each new nucleus being composed of one-half of the chromatin of the male and femiale pronuclei, and each nucleus having a centrosome. At the same time that the division of the pronuclei takes place a corresponding division of the whole Q'g'g occurs. The egg elongates (Model 2), a constriction takes place, and finally, coincident with the formation of the two new nuclei, there is
Text Appearing After Image:
MODEL 3 Completion of first cleavage. Two cells. Polar bodies in the furrow be- tween them. Daughter nuclei and centrospheres in each cell. a complete separation of the egg into two halves, forming two new cells, each made up of protoplasm and yolk, like the single undivided egg, and each having a nucleus with its centrosome (Model 3). One of these two new cells gives rise to the anterior portion of the embryo, the other to the posterior. Beginning with this, the first cleavage, up to the time when the larva is capable of taking in new food, the whole process of

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https://www.flickr.com/photos/internetarchivebookimages/17971842970/

Author Internet Archive Book Images
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
1906
Flickr tags
InfoField
  • bookid:americanmuseumjo06amer
  • bookyear:c1900-[1918]
  • bookdecade:c190
  • bookcentury:c100
  • bookauthor:American_Museum_of_Natural_History
  • booksubject:Natural_history
  • bookpublisher:New_York_American_Museum_of_Natural_History
  • bookcontributor:American_Museum_of_Natural_History_Library
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:51
  • bookcollection:biodiversity
  • bookcollection:americanmuseumnaturalhistory
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
27 May 2015
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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/17971842970. It was reviewed on 20 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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