ALFRED RUSSEL WALLACE, who ranks with Darwin as an expounder of the theory of Evolution through Natural Selection, was born in Monmouthshire, England, January 8th, 1822. He was an architect by profession, but in 1845 he gave up everything else for the study of natural history, to which he devoted his life. After travel and scientific research in South America and the Malay Archipelago, he prepared a paper “On the Tendency of Varieties to Depart Indefinitely from the Original Type,” which was read July 1st, 1858. Darwin’s paper on the same subject appeared simultaneously with it. The two naturalists, working under a common impulse and following parallel lines of investigation, reached a similar conclusion and continued thereafter to co-operate in developing their joint theory. Wallace’s bent was more towards original investigation than Darwin’s, whose greatest successes are due to his genius for co-ordinating and comprehending the material accumulated for him by others. Among Wallace’s notable publications are “The Malay Archipelago,” 1869; “Contributions to the Theory of Natural Selection,” 1870; “Tropical Nature,” 1878; and “Land Nationalization,” 1882.