On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of SelectionRead Books Ltd, 25 maj 2016 - 40 This early work by Alfred Russel Wallace was originally published in 1858 and we are now republishing it with a brand new introductory biography. 'On the Tendency of Species to form Varieties' is a landmark article on Wallace's ideas of natural selection in relation to evolutionary theory. Alfred Russel Wallace was born on 8th January 1823 in the village of Llanbadoc, in Monmouthshire, Wales. Wallace was inspired by the travelling naturalists of the day and decided to begin his exploration career collecting specimens in the Amazon rainforest. He explored the Rio Negra for four years, making notes on the peoples and languages he encountered as well as the geography, flora, and fauna. While travelling, Wallace refined his thoughts about evolution and in 1858 he outlined his theory of natural selection in an article he sent to Charles Darwin. Wallace made a huge contribution to the natural sciences and he will continue to be remembered as one of the key figures in the development of evolutionary theory. |
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Alfred Russel Wallace ALFRED WALLACE animal population Asa Gray average number become altogether extinct best adapted breeding called into action carnivora cause Charles Darwin checks circumstances continue diminish in numbers divergence domestic animals Domestic Races effect eggs enemies exterminate external conditions faculties FORM VARIETIES fox or dog greater number habits increase in numbers individual existence inhabitants least favourable seasons less Linnean Society Malay Archipelago MEANS OF SELECTION modifications of form NATURAL MEANS natural selection never number of individuals obtain food occasionally occurring among wild offspring Origin of Species original type parent species passenger pigeon peculiar period PERPETUATION OF VARIETIES procuring food rabbits Races and true rear recurrent regular supply seeds Sir Charles Lyell SPECIES BY NATURAL struggle supply of food survive tend Tendency of Varieties Ternate theory of natural true Species unbalanced deficiency Variation of Organic VARIETIES AND SPECIES Wallace’s wild animals Wild cats young