. . "The Darwin\u2013Wallace Medal is a medal awarded by the Linnean Society of London for \"major advances in evolutionary biology\". Historically, the medals have been awarded every 50 years, beginning in 1908. That year marked 50 years after the joint presentation by Charles Darwin and Alfred Russel Wallace of two scientific papers\u2014On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection\u2014to the Linnean Society of London on 1 July 1858."@en .