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The theory of natural selection was published by naturalist [[Darwin, Charles|Charles Darwin]] in his book ''[[The Origin of Species|On The Origin of Species by Means of Natural Selection or The Preservation of Favored Races in the Struggle for Life]]'' (1859) and also by Alfred Russel Wallace in his paper ''On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection'' (1858). Charles Lyell and Joseph Dalton Hooker decided on a joint publication at the Linnean Society of London in 1858 of Wallace's paper together with an extract from Darwin's 1844 essay and his letter to Asa Gray and summarized:<ref>Charles Darwin, Alfred Wallace, On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection, Zoological Journal of the Linnean Society, Volume 3, Issue 9, August 1858, Pages 45–62, https://doi.org/10.1111/j.1096-3642.1858.tb02500.x</ref><ref>[https://www.biodiversitylibrary.org/page/2311239#page/127/mode/1up 1858 Online link to Summary by Joseph Hooker and Charles Lyell]]</ref>

The theory of natural selection was published by naturalist [[Darwin, Charles|Charles Darwin]] in his book ''[[The Origin of Species|On The Origin of Species by Means of Natural Selection or The Preservation of Favored Races in the Struggle for Life]]'' (1859) and also by Alfred Russel Wallace in his paper ''On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection'' (1858). Charles Lyell and Joseph Dalton Hooker decided on a joint publication at the Linnean Society of London in 1858 of Wallace's paper together with an extract from Darwin's 1844 essay and his letter to Asa Gray and summarized:<ref>Charles Darwin, Alfred Wallace, On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection, Zoological Journal of the Linnean Society, Volume 3, Issue 9, August 1858, Pages 45–62, https://doi.org/10.1111/j.1096-3642.1858.tb02500.x</ref><ref>[https://www.biodiversitylibrary.org/page/2311239#page/127/mode/1up 1858 Online link to Summary by Joseph Hooker and Charles Lyell]]</ref>

{{cquote|MY DEAR SIR,—The accompanying papers, which we have the honour of communicating to the Linnean Society, and which all related to the same subject, viz. the Laws which affect the Production of Varieties, Races, and Species, contain the results of the investigations of two indefatigable naturalists, Mr. Charles Darwin and Mr. Alfred Wallace.

{{cquote|The gentlemen having, independently and unknown to one another, conceived the same very ingenious theory to account for the appearance and perpetuation of varieties and of specific forms on our planet, and both fairly claim the merit of being original thinkers in this important line of inquiry; but neither of them having published his views, though Mr. Darwin has for many years past been repeatedly urged by us to do so, and both authors having now unreservedly placed their papers in our hands, we think it would best promote the interests of science that a selection from them should be laid before the Linnean Society. Taken in the order of their dates, they consist of:-

The gentlemen having, independently and unknown to one another, conceived the same very ingenious theory to account for the appearance and perpetuation of varieties and of specific forms on our planet, and both fairly claim the merit of being original thinkers in this important line of inquiry; but neither of them having published his views, though Mr. Darwin has for many years past been repeatedly urged by us to do so, and both authors having now unreservedly placed their papers in our hands, we think it would best promote the interests of science that a selection from them should be laid before the Linnean Society. Taken in the order of their dates, they consist of:—

I. Extract from an unpublished Work on Species, by C. DARWIN, Esq., consisting of a portion of a Chapter entitled, "On the Variation of Organic Beings in a state of Nature; on the Natural Means of Selection; on the Comparison of Domestic Races and true Species."..

II. Abstract of a Letter from C. DARWIN, Esq., to Prof. ASA GRAY, Boston, US, dated Down, September 5th, 1857...

 

II. Abstract of a Letter from C. DARWIN, Esq., to Prof. ASA GRAY, Boston, US, dated Down, September 5th, 1857.

III. On the Tendency of Varieties to depart indefinitely from the Original Type. By ALFRED RUSSEL WALLACE.''}}

III. On the Tendency of Varieties to depart indefinitely from the Original Type. By ALFRED RUSSEL WALLACE.''}}