When HMS Beagle made its first landfall in January 1832, the twenty-two-year-old Charles Darwin set about taking detailed notes on geology. He was soon planning a volume on the geological structure of the places visited, and letters to his sisters confirm that he identified himself as a ‘geologist’. For a young gentleman of his class and income, this was a remarkable thing to do. Darwin's conversion to evolution by selection has been examined so intensively that it is easy to forget (...) that the most extraordinary decision he ever made was to devote his life to the study of the natural world by becoming a geologist. It is only slightly less astonishing that he should have decided to align his work with Charles Lyell's controversial programme of geological reform, which had almost no followers in England. (shrink)

1990 marked the 150th anniversary of the publication of Charles Darwin's first major scientific theory. The paper, first presented by Darwin to the Geological Society of London on 7 March 1838, was entitled ‘On the Connexion of Certain Volcanic Phenomena and on the Formation of Mountain-Chains and the Effects of Continental Elevations.’ The paper was a remarkable attempt to develop a global tectonic synthesis. It was the culmination of a period of intensive geological activity by Darwin – then twenty-nine – (...) who had returned from the Beagle voyage only eighteen months previously. The present article reviews the development of Darwin's views, their impact upon his contemporaries, their role in shaping his later views on the origin of species, and their significance in scientific theory-making. It draws, in part, on Darwin's unpublished geological notes and jottings. This paper, and the papers by Sandra Herbert and James Secord that accompany it, were delivered at a symposium which I organized at the Geological Society of London on 31 October 1988 to mark the 150th anniversary of the reading of Darwin's paper. (shrink)

Phillip Sloan has thoroughly documented the importance of Darwin's general invertebrate research program in the period from 1826 to 1836 and demonstrated how it had an impact on his conversion to transformism. Although Darwin later spent eight years of his life investigating barnacles, this period has received less treatment in studies of Darwin and the development of his thought. The most prominent question for the barnacle period that has been attended to is why Darwin "delayed" in publishing his theory of (...) evolution. A related but distinct question concerns the variety of earlier events and influences that led Darwin to the study of "Cirripedia" in 1846, apart from its role in the trajectory that led to "On the Origin of Species ". In this paper I focus on four specific episodes prior to 1846 that inform a picture of why Darwin had an antecedent interest in barnacles: the orientation to collecting strange and curious invertebrate organisms, as well as the strong affinities of Darwin's invertebrate collecting on the Beagle voyage with the work of John Vaughan Thompson; the critical role of marine invertebrate fossils in Darwin's geological reasoning aboard the Beagle and exemplified in his "Geological Observations of South America;" the strange absence of a "Zoology of the Beagle" volume on invertebrates and Darwin's original intent to publish some of the descriptions himself; and the noteworthy presence of barnacles in Darwin's transformation theorizing between 1837 and 1839. There is a wealth of support for the thesis that Darwin had a strong interest in cirripedes prior to the formal barnacle research, blunting arguments that it was psychological aversion or a feeling of inferiority about his taxonomic abilities that drove Darwin to the cirripedes. (shrink)

On occasion Charles Darwin can seem our scientific contemporary, for the subjects he engaged remain engaging today, but in his role as author he belongs to the past. It is not customary today for scientists to write book after book, as Darwin did, or for these books to serve as the primary vehicle of scientific communication. For Darwin, however, the book was central. He wrote at least eighteen, depending on what one counts; in hisAutobiographyhe entitled the section describing his most (...) important work ‘An account how several books arose’; and in his personal Journal, begun in August 1838 after he had come to a mature sense of himself, he organized entries around his books. A characteristic entry is that for 1846: ‘Oct. 1st. Finished last proof of my Geolog. Observ. on S. America; This volume, including Paper in Geolog. Journal on the Falkland Islands took me 18 & 1/2 months:–’. Further, almost always he had a book under way: when one was complete, the next was begun. He called them the milestones to his life. (shrink)