Principles of evolution by natural selection They published their scientific ideas jointly in 1858. This encouraged Darwin to collect his scientific ideas and collaborate with Wallace. Īfter a variety of zoological discoveries, Wallace proposed a theory of evolution which matched the unpublished ideas Darwin had kept secret for nearly 20 years. He is best known for studying warning colouration in animals, one example being the golden birdwing butterfly ( Ornithoptera croesus ), as well as his theory of speciation. Original journal part, completely unopened in the original printed pink wrappers (imperceptible soiling to wrappers, otherwise, fresh and clean).Wallace worked around the world gathering evidence to support his evolutionary theory. Freeman 346 PMM 344a Grolier 23a (offprint issue) Norman 591 (offprint issue). All 3 bear the date 20 August 1858, and have priority over the later published complete journal volume made from reserved stock of the parts with reset titles. Besides the author's offprints, there were 4 forms of the Journal: separate parts were issued under the Zoology section (the present lot, in pink wrappers), the Botany section (green wrappers), or both together (in blue wrappers). The Darwin-Wallace paper, due to the publishing quirks of the Linnean Society, was available in 5 different forms, but all were printed from the same setting of type. Thus, on 1 July 1858, Lyell read Darwin's essay and letter, and Hooker read Wallace's 'On the Tendency of Varieties to depart indefinitely from the Original Type' to the Linnean Society, publishing them in the present issue of the Journal, and preparing the way for the publication of On the Origin of Species on 24 November 1859. Lyell and Sir Joseph Dalton Hooker suggested that Wallace publish his paper, prefaced by Darwin's essay of 1844 and a letter from Darwin to Asa Gray on natural selection dated 5 September 1857, which demonstrated that Darwin's theory had 'remained unaltered from 1839 to 1857' ('On the Tendency of Species.', p.46). In February 1858 Wallace had independently developed the same theory as Darwin, and on 18 June 1858, Darwin received a letter from Wallace 'containing a perfect summary of the views which he had worked out in the preceding twenty years' (DSB III, p.573). Darwin began to write a book on evolution and natural selection in the summer of 1858, but the work – which was to become On the Origin of Species – progressed slowly. In April 1856 he described the theory to Sir Charles Lyell (whose Principles of Geology had been a major influence on the geological studies that led Darwin to the question of evolution – see lot 169), who urged Darwin to publish his hypothesis. However, he did not publish or debate it at that time, and, after writing an unpublished essay on the subject between 18 which was shown to a limited circle of friends, he did little further work on it. Darwin's theory of evolution – drawn from his studies during the voyage of the Beagle and clarified by Malthus's concept of the self-regulation of population growth – crystallised in 1838. 'The first printed exposition of the theory of evolution by natural selection' (Norman 591). 'On the Tendency of Species to form Varieties.' In: Journal of the Proceedings of the Linnean Society, Vol.
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