6.2 KiB
| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Charles Darwin | 6/12 | https://en.wikipedia.org/wiki/Charles_Darwin | reference | science, encyclopedia | 2026-05-05T04:06:05.516999+00:00 | kb-cron |
In October 1838, that is, fifteen months after I had begun my systematic enquiry, I happened to read for amusement Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here, then, I had at last got a theory by which to work... By mid-December, Darwin saw a similarity between farmers picking the best stock in selective breeding, and a Malthusian Nature selecting from chance variants so that "every part of newly acquired structure is fully practical and perfected", thinking this comparison "a beautiful part of my theory". He later called his theory natural selection, an analogy with what he termed the "artificial selection" of selective breeding. On 11 November, he returned to Maer and proposed to Emma, once more telling her his ideas. She accepted, then, in exchanges of loving letters, showed how she valued his openness in sharing their differences, while expressing her strong Unitarian beliefs and concerns that his honest doubts might separate them in the afterlife. While he was house-hunting in London, bouts of illness continued and Emma wrote urging him to get some rest, almost prophetically remarking "So don't be ill any more my dear Charley till I can be with you to nurse you." He found what they called "Macaw Cottage" (because of its gaudy interiors) in Gower Street, then moved his "museum" in over Christmas. On 24 January 1839, Darwin was elected a Fellow of the Royal Society (FRS). On 29 January, Darwin and Emma Wedgwood were married at Maer in an Anglican ceremony arranged to suit the Unitarians, then immediately caught the train to London and their new home.
=== Geology books, barnacles, evolutionary research ===
Darwin now had the framework of his theory of natural selection "by which to work", as his "prime hobby". His research included extensive experimental selective breeding of plants and animals, finding evidence that species were not fixed and investigating many detailed ideas to refine and substantiate his theory. For fifteen years this work was in the background to his main occupation of writing on geology and publishing expert reports on the Beagle collections, in particular, the barnacles. The impetus of Darwin's barnacle research came from a collection of a barnacle colony from Chile in 1835, which he dubbed Mr. Arthrobalanus. His confusion over the relationship of this species (Cryptophialus minutus) to other barnacles caused him to fixate on the systematics of the taxa. He wrote his first examination of the species in 1846, but did not formally describe it until 1854. FitzRoy's long-delayed Narrative was published in May 1839. Darwin's Journal and Remarks got good reviews as the third volume, and on 15 August, it was published on its own. Early in 1842, Darwin wrote about his ideas to Charles Lyell, who noted that his ally "denies seeing a beginning to each crop of species". Darwin's book The Structure and Distribution of Coral Reefs on his theory of atoll formation was published in May 1842 after more than three years of work, and he then wrote his first "pencil sketch" of his theory of natural selection. To escape the pressures of London, the family moved to rural Down House in Kent in September. On 11 January 1844, Darwin mentioned his theorising to the botanist Joseph Dalton Hooker, writing with melodramatic humour "it is like confessing a murder". Hooker replied, "There may, in my opinion, have been a series of productions on different spots, & also a gradual change of species. I shall be delighted to hear how you think that this change may have taken place, as no presently conceived opinions satisfy me on the subject."
By July, Darwin had expanded his "sketch" into a 230-page "Essay", to be expanded with his research results if he died prematurely. In November, the anonymously published sensational best-seller Vestiges of the Natural History of Creation brought wide interest in transmutation. Darwin scorned its amateurish geology and zoology, but carefully reviewed his own arguments. Controversy erupted, and it continued to sell well despite contemptuous dismissal by scientists. Darwin completed his third geological book in 1846. He now renewed his interest in marine invertebrates and, using expertise from his student days with Grant, dissected and classified the barnacles he had collected on the voyage. He enjoyed observing their beauty and thought about comparisons with allied structures. In 1847, Hooker read the "Essay" and sent notes that provided Darwin with the calm critical feedback that he needed, but would not commit himself and questioned Darwin's opposition to continuing acts of creation. In an attempt to improve his chronic ill health, Darwin went in 1849 to Dr. James Gully's Malvern spa and was surprised to find some benefit from hydrotherapy. Then, in 1851, his treasured daughter Annie fell ill, reawakening his fears that his illness might be hereditary. She died the same year after a long series of crises. In eight years of work on barnacles, Darwin's theory helped him to find "homologies" showing that slightly changed body parts served different functions to meet new conditions. In some genera he found minute males parasitic on hermaphrodites, showing an intermediate stage in evolution of distinct sexes. In 1853, it earned him the Royal Society's Royal Medal, and it made his reputation as a biologist. Upon the conclusion of his research, Darwin declared, "I hate a barnacle as no man ever did before." In 1854, he became a Fellow of the Linnean Society of London, gaining postal access to its library. He began a major reassessment of his theory of species, and in November realised that divergence in the character of descendants could be explained by them becoming adapted to "diversified places in the economy of nature".