File:The biology of the frog (1927) (19761660053).jpg

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Title: The biology of the frog
Identifier: biologyoffrog00holm_0 (find matches)
Year: 1927 (1920s)
Authors: Holmes, Samuel J. (Samuel Jackson), 1868-
Subjects: Frogs
Publisher: New York : The Macmillan company
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries

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THE DEVELOPMENT OF THE FROG 105 tube proceeds both forward and backward from this point. The fusion extends backward so that folds on either side of the blastopore close in above that opening in such a way that it becomes no longer visible from the outside. As the medullary tube is completed it is constricted off from the ectoderm above, and the latter becomes continuous over the
Text Appearing After Image:
Fig. 35.—Embryos. Gp, gill plate ; Gs, Gs', two gill slits ; $, suckers; Sp, serse plate; An, anus. (From Morgan, after Schultze.) mid-dorsal line. Subsequently it develops into the brain and spinal cord of the embryo. As the above changes are taking place the embryo elongates in the direction of the neural tube, which marks the longitudinal axis of the future animal. On either side of the anterior end of the neural tube there appears a pair of thickenings of the ectoderm. The anterior members of

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https://www.flickr.com/photos/internetarchivebookimages/19761660053/

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Flickr tags
InfoField
  • bookid:biologyoffrog00holm_0
  • bookyear:1927
  • bookdecade:1920
  • bookcentury:1900
  • bookauthor:Holmes_Samuel_J_Samuel_Jackson_1868_
  • booksubject:Frogs
  • bookpublisher:New_York_The_Macmillan_company
  • bookcontributor:ASC_York_University_Libraries
  • booksponsor:York_University_University_of_Toronto_Libraries
  • bookleafnumber:125
  • bookcollection:YorkUniversity
  • bookcollection:ontario_council_university_libraries
  • bookcollection:toronto
  • BHL Collection
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7 August 2015
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