1735 Linnaeus publishes Systema Naturae Carl Linnaeus introduces a systematic method of classifying living things, shaping later debates about commonality and difference among species. 1749 Buffon begins Histoire naturelle Georges-Louis Leclerc, comte de Buffon, publishes the first volumes of Histoire naturelle and questions fixed views of species and Earth's age. 1794 Erasmus Darwin publishes Zoonomia Erasmus Darwin presents early evolutionary ideas about the transformation of living forms. 1798 Malthus publishes Essay on Population Thomas Robert Malthus's essay later influences Charles Darwin's thinking about competition and survival. 1809 Lamarck publishes Philosophie zoologique Jean-Baptiste Lamarck offers one of the first coherent theories of species transformation. 1830 Lyell begins Principles of Geology Charles Lyell argues for gradual geological change over deep time, strengthening the temporal framework needed for evolution. December 27, 1831 Darwin sails on HMS Beagle Charles Darwin departs on the Beagle voyage, gathering observations that later contribute to his theory of evolution by natural selection. 1838 Darwin formulates natural selection After reading Malthus, Darwin develops the core idea of natural selection as a mechanism of evolutionary change. July 1, 1858 Darwin and Wallace papers are presented Papers by Charles Darwin and Alfred Russel Wallace on natural selection are presented to the Linnean Society of London. November 24, 1859 On the Origin of Species is published Darwin publishes On the Origin of Species, the foundational text of modern evolutionary biology. 1865 Mendel presents work on inheritance Gregor Mendel reports experimental results on inheritance in pea plants, laying a foundation for later evolutionary gen… 1883 Weismann advances germ-plasm theory August Weismann argues against the inheritance of acquired characteristics and strengthens a heredity-based account of… 1900 Mendel's work is rediscovered Researchers including Hugo de Vries, Carl Correns, and Erich von Tschermak revive Mendelian genetics, reshaping evoluti… 1908 Hardy-Weinberg principle is formulated G. H. Hardy and Wilhelm Weinberg show how allele frequencies behave under ideal conditions, creating a baseline for pop… 1918 Fisher unites Mendelian genetics and biometrics R. A. Fisher's work on the correlation between relatives helps bridge discrete inheritance and continuous variation. 1930 Fisher publishes The Genetical Theory of Natural Selection Fisher deepens the mathematical basis of evolutionary theory and helps establish population genetics. 1937 Dobzhansky publishes Genetics and the Origin of Species Theodosius Dobzhansky's book becomes a central text in the modern evolutionary synthesis. 1942 Huxley names the modern synthesis Julian Huxley publishes Evolution: The Modern Synthesis, consolidating genetics, systematics, and natural selection int… 1953 DNA double helix is described James Watson and Francis Crick, drawing on key evidence including Rosalind Franklin's work, describe the structure of D… 1968 Kimura proposes neutral theory Motoo Kimura introduces the neutral theory of molecular evolution, expanding debate over the causes of genetic change.