Alfred Russel Wallace's Unrealized Last Book: Insights from the Plan for Darwin and Wallace

In honour of the two hundredth birthday of naturalist Alfred Russel Wallace (1823–1913) we present a transcription and analysis of the plan for Wallace's unrealized final book. Recently come to light, Darwin and Wallace was to have been a volume of eight chapters published by the well-known London publishing house of John Murray in the spring of 1915, a project derailed by Wallace's death at the age of 90 in November 1913. Drawing on letters, manuscripts and contemporary published works, we show how the chapter outlines illuminate Wallace's late-life thinking about his and Darwin's working methods, the factors contributing to their independent discovery of natural selection and contemporary challenges to Darwin–Wallace evolutionary gradualism and natural selection by the neo-Lamarckian, mutationist and early Mendelian schools during the period dubbed the ‘eclipse of Darwinism’. Wallace's planned book provides insight into how the co-founder of modern evolutionary biology saw his legacy in relation to Darwin's, and his role as fierce and eloquent defender of his and Darwin's theory during a fascinating period in the history of evolutionary biology. In the emergence of neo-Darwinism in the ‘Modern Synthesis’ period, Wallace's contributions were largely omitted, an oversight that Darwin and Wallace may have prevented had it been realized.