Wikimedia Commons

File:The first principles of heredity; with 75 illustrations and diagrms (1910) (14778962781).jpg

Original file ‎(1,260 × 926 pixels, file size: 102 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary edit

The categories of this image need checking. You can do so here.
  • Please remove redundant categories and try to put this image in the most specific category/categories.
  • You can remove this template by clicking here (or on the first line).



Description
English:

Identifier: firstprincipleso00herb (find matches)
Title: The first principles of heredity; with 75 illustrations and diagrms
Year: 1910 (1910s)
Authors: Herbert, S. (Solomon), b. 1874
Subjects: Heredity
Publisher: London, A. and C. Black
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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:
D Fig. 24,—Ovum and DispositionOF Yolk. (After Thomson.) A, ovum with diffuse yolk (sponge) ;B, ovum with central yolk (cray-fish) ; C, ovum with polar yolk(frog) ; D, ovum with predomin-ant yolk (bird). Fig. 25.—Spermatozoon.(After Wilson.) (From Weismann, TheEvolution Theory.) sp, point; 77, nucleus ; c,centrosome; m, middle-piece ; aXy tail. where nearly the whole egg is taken up by the yolk excepta tiny part at the upper pole of it, as in Fishes, Reptiles,and Birds. 36 THE FIRST PRINCIPLES OF HEREDITY (c) Spermatozoon. The Spermatozoon is, as a rule, very much smaller thanthe corresponding ovum. Its form is adapted to itsfunction, for it actively seeks and penetrates the ovum. The typical spermatozoon—as, e.g., in man—consists ofa small pointed head, composed nearly entirely of thenucleus, a middle piece, containing the centrosome, and along contractile tail, by means of which the spermatozoon
Text Appearing After Image:
Fig. 26.—Spermatozoa. (From Geddes and Thomson, The Evolution of Sex.) a, crayfish ; b, lobster ; c, crab ; d, ascarid ; e, water-flea —moina ;f, man ; §■, ray ; h, rat; i, guinea-pig ; k, beetle—immaturestage ; /, sponge. effects its rapid undulatory movements. The shape inother cases may differ, be starlike or clublike, but theactive amoeboid movements are an essential feature of it. III.—MA TURA TION. Both germ-cells, ovum as well as spermatozoon, possessthe same number of chromosomes as the ordinary body-cells, which, as has already been remarked, is constant for THE GERM-CELLS 37 any given species. Before, however, the germ-cells areready to unite in the act of fertilization, they undergocertain changes, which have the effect of leaving them withonly half the number of chromosomes they had previously.This process in the ovum is called its maturation,while the same end is achieved for the spermatozoon duringits development—i.e., during the process of spermato-genesis.

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/14778962781/

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:firstprincipleso00herb
  • bookyear:1910
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Herbert__S___Solomon___b__1874
  • booksubject:Heredity
  • bookpublisher:London__A__and_C__Black
  • bookcontributor:NCSU_Libraries
  • booksponsor:NCSU_Libraries
  • bookleafnumber:49
  • 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@N07/14778962781. 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
current11:16, 20 September 2015Thumbnail for version as of 11:16, 20 September 20151,260 × 926 (102 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': firstprincipleso00herb ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Ffirstprinciples...

You cannot overwrite this file.

There are no pages that use this file.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:The_first_principles_of_heredity;_with_75_illustrations_and_diagrms_(1910)_(14778962781).jpg&oldid=679314253"