PART I: INTRODUCTION: DEVELOPMENT OF THE THEORY OF EVOLUTION .- PART II: THE DOCUMENTS.- The Question of Evolution Arises.- Carl Linnaeus, Genera Plantarum: The Families of Plants, 1787.- Alexander von Humboldt, Personal Narrative of Travels to the Equinoctial Regions of the New Continent during the Years 1799-1804.- Erasmus Darwin, The Temple of Nature; or the Origin of Society, 1803.- Josiah Wedgwood, 'Am I Not a Man and a Brother?' 1787.- An American Version, 1837 .- Thomas Jefferson, Notes on the State of Virginia, 1787.- Georges Cuvier, Essay on the Theory of the Earth, with Mineralogical Illustrations by Professor Jameson, 1822.- Thomas Robert Malthus, An Essay on the Principle of Population, 1798.- William Paley, Natural Theology, 1802.- Jean Baptiste de Lamarck, Zoological Philosophy, 1809.- Charles Lyell, Principles of Geology, 1832.- John Herschel, Letter to Charles Lyell, 1836.- Charles Darwin Addresses the Question of Evolution.- Charles Darwin, Journal of Researches, 1839.- Richard Owen, Glyptodon clavipes, (Gigantic Extinct Armadillo), 1845.- Charles Darwin, Ornithological Notes, 1836.- Charles Darwin, Notebook B, 1837.- Emma Darwin, Letter to Charles Darwin, c. February 1839.- Roderick Murchison, Presidential Address to the Geological Society of London, 1843.- [Robert Chambers,] Vestiges of the Natural History of Creation, 1844.- Alfred Russel Wallace, On the Law Which Has Regulated the Introduction of New Species, 1855.- Charles Darwin, Letter to Asa Gray, 1857.- Alfred Russel Wallace, Recollections, 1858.- Charles Darwin, Recollections, 1831-1858.- Whitwell Elwin, Letter to John Murray, 1859 .- Charles Darwin, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, 1859.- Athenaeum Report on the 1860 Meeting of the British Association for the Advancement of Science .- Asa Gray, Review of the Origin, 1860.- Louis Agassiz, Review of the Origin, 1860.- Grave Sites of Asa Gray and Louis Agassiz, Mount Auburn Cemetery, Cambridge, Massachusetts.- Charles Darwin and Asa Gray, Letters, 1861-1866.