File:The cell in development and inheritance (1902) (14782943182).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(1,682 × 1,664 pixels, file size: 366 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]



Description
English:

Identifier: cellindevelopmenwils2 (find matches)
Title: The cell in development and inheritance
Year: 1902 (1900s)
Authors: Wilson, Edmund B. (Edmund Beecher), 1856-1939
Subjects: Cell Physiological Phenomena Cells
Publisher: New York : Macmillan
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
-cell stage. C. Half eight-cell stage, fromisolated blastomere of the two-cell stage. D. Half twelve-cell stage succeeding. E. Two stagesin the cleavage of an isolated blastomere of the four-cell stage; above a one-fourth eight-cell stage,below a one-fourth sixteen-cell stage. able barrier to complete development. What determines the limita-tions of development in these various cases. They cannot be due tonuclear specification ; for in the ctenophore the fragment of an wiseg-mented Qgg, containing the normal egg-nucleus, gives rise to a defec-tive larva; and my experiments on Nereis show that even in a highly NATURE AND CAUSES OF DIFFERENTIATION 421 determinate cleavage, essentially like that of the snail, the nuclei maybe shifted about by pressure without altering the end-result. Neithercan they lie in the form of the dividing mass as some authors haveassumed; for in Cramptons experiments the half or quarter blasto-mere does not retain the form of a half or quarter sphere, but rounds
Text Appearing After Image:
Pig. 191. — Double embryos of frog developed from eggs inverted when in the two-cell stage. (O. SCHULTZE.) A. Twins with heads turned in opposite directions. B. Twins united back to back. C. Twinsunited by their ventral sides. D. Double-headed tadpole. off to a spheroid hke the Qgg. But if the limiting conditions lieneither in the nucleus nor in the form of the mass, we must seek themin the cytoplasm; and if we find here factors by which the tendencyof the part to develop into a whole may be, as it were, hemmed in, weshall reach a proximate explanation of the mosaic-like character ofcleavage shown in the forms under consideration, and the mosaic 422 INHERITANCE AND DEVELOPMENT theory of cytoplasmic localization will find a substantial if somewhatrestricted basis. That we are here approaching the true explanation is indicated bycertain very remarkable and interesting experiments on the frogs o-^^,which prove that each of the first two blastomeres may give rise eitherto a half-embryo

Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Date
Source

https://www.flickr.com/photos/internetarchivebookimages/14782943182/

Author Internet Archive Book Images
Permission
(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.
Flickr tags
InfoField
  • bookid:cellindevelopmenwils2
  • bookyear:1902
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Wilson__Edmund_B___Edmund_Beecher___1856_1939
  • booksubject:Cell_Physiological_Phenomena
  • booksubject:Cells
  • bookpublisher:New_York___Macmillan
  • bookcontributor:Francis_A__Countway_Library_of_Medicine
  • booksponsor:Open_Knowledge_Commons_and_Harvard_Medical_School
  • bookleafnumber:448
  • bookcollection:medicalheritagelibrary
  • bookcollection:francisacountwaylibrary
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
30 July 2014

Licensing

[edit]
This image was taken from Flickr's The Commons. The uploading organization may have various reasons for determining that no known copyright restrictions exist, such as:
  1. The copyright is in the public domain because it has expired;
  2. The copyright was injected into the public domain for other reasons, such as failure to adhere to required formalities or conditions;
  3. The institution owns the copyright but is not interested in exercising control; or
  4. The institution has legal rights sufficient to authorize others to use the work without restrictions.

More information can be found at https://flickr.com/commons/usage/.

Please add additional copyright tags to this image if more specific information about copyright status can be determined. See Commons:Licensing for more information.
This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14782943182. It was reviewed on 20 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

20 September 2015

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current10:54, 20 September 2015Thumbnail for version as of 10:54, 20 September 20151,682 × 1,664 (366 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': cellindevelopmenwils2 ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fcellindevelopmen...

You cannot overwrite this file.

There are no pages that use this file.

File usage on other wikis

The following other wikis use this file:

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:The_cell_in_development_and_inheritance_(1902)_(14782943182).jpg&oldid=609806534"