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English: Charles Darwin's 1837 sketch, his first diagram of an evolutionary tree from his First Notebook on Transmutation of Species (1837) on view at the Museum of Natural History in Manhattan. Text: 
I think 
[graph] 
B
D C 
1 A
Case must be that one
generation then should be
as many living as now.
To do this & to have many species in
same genus (as is) requires extinction.
The text continues outside the image: Thus between A & B immense gap of relation. C & B the finest gradation, B & D rather greater distinction. Thus genera would be formed. — bearing relation (page 37) to ancient types. — with several extinct forms for if each species an ancient (1) is capable of making 13 recent forms, twelve of the contemporarys must have left no offspring at all, so as to keep number of species constant. — With respect to extinction we can easy see that variety of ostrich, Petise may not be well adapted, and thus perish out, or on other hand like Orpheus being favourable (page 38) many might be produced. — This requires principle that the permanent varieties produced by inter confined breeding & changing circumstances are continued & produced according to the adaptation of such circumstances, & therefore that death of species is a consequence (contrary to what would appear from America). Source of this text: User fileunderwater at https://biology.stackexchange.com/questions/46481/darwins-first-sketch-of-a-phylogenetic-tree , consulted on 26 April 2021.
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Autore Charles Darwin
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This file was reviewed on 27 May 2009 by the administrator or trusted user NuclearWarfare (talk), who confirmed the Public Domain status on that date.
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http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=123771784 23:13, 28 August 2007 w:en:User:Ragesoss
http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=123771784 09:47, 18 April 2007 w:en:User:Samsara
http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=123771708 09:46, 18 April 2007 w:en:User:Samsara
http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=119617296 01:15, 2 April 2007 w:en:User:BenB4
http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=119617220 01:15, 2 April 2007 w:en:User:BenB4
http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=118744679 10:22, 29 March 2007 w:en:User:Jrockley
http://en.wikipedia.org/w/index.php?title=Image:Darwins_first_tree.jpg&redirect=no&oldid=64036998 00:05, 16 July 2006 w:en:User:BenB4 (<a href="/wiki/Charles_Darwin" title="Charles Darwin">Charles Darwin</a>'s 1837 sketch, his first diagram of an evolutionary tree from his ''First Notebook on Transmutation of Species'' (1837) on view at the the Museum of Natural History in Manhattan. Source: http://www.english.uga.edu/nhilton/4890/darwin/d)

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attuale08:40, 26 mag 2022Miniatura della versione delle 08:40, 26 mag 2022695 × 616 (147 KB)CactiStaccingCranesharper and cleaner image
16:47, 29 ago 2007Miniatura della versione delle 16:47, 29 ago 2007610 × 612 (41 KB)BetacommandBotTranswiki approved by: w:en:User:Ragesoss This image was copied from wikipedia:en. The original description was: == Summary == w:en:Charles Darwin's 1837 sketch, his first diagram of an evolutionary tree from his ''First Notebook on Transmutati

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