[270]

[top left corner damaged. Several small holes but not clearly pin holes]

(270

Sect 7. Instinct

oxen with the longest horns, thus a breed could be produced slowly formed always producing oxen with extremely extraordinary  long horns; & yet no one ox can could ever have propagated its kind. Thus I believe it has been with social insects: slight modifications of structure, or of instinct, correlated with a sterile condition of certain members, have been advantageous to the community; consequently the fertile males and females of the same community have been have flourished, & have transmitted to their sterile fertile offspring, a tendency to produce sterile members having the same peculiarity. And I believe that this process has been repeated in the sterile members, & so onwards   until natural selection has furnished producedthe prodigious difference that prodigious amount of difference [several words excised] sterile females of the same species have been produced [words possibly excised] in many of the social insects.

[bottom of page excised]

[270v]

[mathematical notes by George Darwin, not transcribed]

 

[Full auction description:
"DARWIN, CHARLES. AUTOGRAPH MANUSCRIPT, TITLE "SECT 7. INSTINCT", BEING THE PAGE NUMBERED "270" FROM THE MANUSCRIPT OF ON THE ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION. (CIRCA 1858). 1 page on the recto only of a leaf of wove blue paper (8 1/4 x 6 in; 208 x 165 mm), 140 words, with several deletions, emendations, and interlineations; geometric exercises on the recto, with Darwin annotations. Formerly folded, bottom of the sheet cut out affecting the first words of the last line. 
The present text corresponds, with a number of stylistic differences, to lines 6 to 21 on page 238 (Chapter 7 - "Instinct" - session "Neuter or sterile insects") of the first edition of On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life.)
In this chapter, Darwin discusses the inheritability of instinct and its role in natural selection. Instinct proves difficult for Darwin to define. It is similar to habit, because it consists of actions performed repeatedly by an individual animal. But unlike habit, which Darwin believes animals learn, instinct is inherited. The causes of innate instincts remain unknown, in the same way the causes of physical variations are unknown. Darwin believes that inherited habits—those learned by a parent and subsequently passed on to offspring by hereditary inheritance—may play a role in the construction of these instincts. However instincts come to be, Darwin argues that natural selection acts on them just as it acts on physical variations. If an instinct is advantageous to a species' survival, natural selection allows organisms with that instinct to survive over others and perpetuate that instinct in their offspring. Thus, natural selection helps create entire species with well-adapted instincts, allowing them to survive in a variety of natural environments.
The text of the manuscript differs with the printed version of the first edition. 
The present page is one of a handful of scattered leaves that survive from the manuscript that Darwin rushed to complete in the second half of 1858. (Just five different leaves have appeared at auction in the last three decades.) Although Darwin had assimilated the researches and observations from his five years as naturalist aboard the survey ship H.M.S. Beagle into the essential formulation of his theory of natural selection by the late 1830s, he was finally spurred to publish after Alfred R. Wallace independently came to a nearly identical conclusion about the transmutation of species. Charles Lyell and Joseph D. Hooker arranged for papers by both Darwin and Wallace to be published in the 20 August 1858 issue of the Journal of the Proceedings of the Linnean Society. Once Wallace's article, "On the Tendency of Varieties to Depart Indefinately from the Original Type" was printed, Darwin rushed to prepare for publication an epitome of the "big species book" that he had been working on since 1856. (Darwin's initial suggestion for a title, An Abstract of an Essay on the Origin of Species and Varieties, was rejected by his publisher as too tentative.)
Originally conceived as a work that might be printed on four or five sheets of paper, On the Origin of Species evolved during the eight months of its writing into a volume of nearly 500 pages. The final scope of Origin of Species prompted Darwin to abandon plans for his "big species book," but he salvaged much of the first part of the manuscript for The Variation of Animals and Plants under Domestication, published in 1868.
Provenance
From the collection of Jacob J. Podell: Jacob J. Podell was an important books and manuscripts collector. The collection, sold at Parke Bernet Galleries on January 29 and 30, 1952, comprised works by Samuel L. Clemens, Charles Dickens, John Keats, Adam Smith, or Walt Whitman. The main part of the collection was composed with Americana material including one of the 4 known copies of Lincoln's second inaugural address, letters by George Washington, etc... The present manuscript was not part of the sale. Mr. Podell also owned a collection of books and manuscripts by Franklin D. Roosevelt that was donated to the University of Columbia by his heirs after his death in 1963."]