Noun
United States botanist who specialized in North American flora and who was an early supporter of Darwin's theories of evolution (1810-1888)
Source: WordNetHis theory including the principle of divergence was complete by 5 September 1857 when he sent Asa Gray a brief but detailed abstract of his ideas. Source: Internet
Wallace's essay was presented to the Linnean Society of London on 1 July 1858, along with excerpts from an essay which Darwin had disclosed privately to Hooker in 1847 and a letter Darwin had written to Asa Gray in 1857. Source: Internet