Alfred Russel Wallace

Lore & Background

Wallace was born on 8 January 1823 in Llanbadoc, Monmouthshire, the eighth of nine children. His father, a failed businessman, moved the family to Hertford when Wallace was five. Wallace attended Hertford Grammar School until age 14, then moved to London to board with his brother John. There he attended lectures at the London Mechanics Institute and was exposed to radical political ideas. He later worked as a land surveyor in Wales and England, collecting plants as an amateur botanist. After his father's death in 1843, he taught drawing and surveying in Leicester, where he met entomologist Henry Walter Bates and began collecting insects. Inspired by Darwin's Journal and Humboldt's Personal Narrative, Wallace decided to travel to the tropics as a collector.

In 1848, Wallace and Bates left for Brazil aboard the Mischief to collect specimens in the Amazon rainforest. Wallace spent four years exploring the Amazon and the Rio Negro, gathering specimens and notes on peoples and languages. He then did extensive fieldwork in the Malay Archipelago, where he identified the faunal divide now termed the Wallace Line, separating the Indonesian archipelago into a western part with Asian-origin animals and an eastern part with Australasian fauna. His 1869 book The Malay Archipelago, an account of his adventures and observations, remains popular.

Wallace was one of the leading evolutionary thinkers of the 19th century. He worked on warning coloration and the Wallace effect, a way natural selection could contribute to speciation by encouraging barriers against hybridisation. In 1864 he was the first to propose that in later human evolution natural selection acted primarily on mental faculties. His 1904 book Man's Place in the Universe was the first serious attempt by a biologist to evaluate the likelihood of life on other planets. He also had a scientific interest in the possibility of life on Mars.

Reader's Guide

Alfred Russel Wallace's significance lies in his independent formulation of the theory of evolution by natural selection, which prompted Darwin to publish On the Origin of Species. His work in biogeography, particularly the identification of the Wallace Line, established him as the 19th century's leading expert on the geographical distribution of animal species and earned him the title 'father of biogeography'. Wallace also contributed to evolutionary theory through his work on warning coloration and the Wallace effect, and he was the first to propose that natural selection acted on mental faculties in later human evolution. Beyond science, he was a social activist critical of 19th-century British social and economic systems, later becoming an active socialist. His advocacy of spiritualism and mind–body dualism strained his relationships with other scientists. He was one of the first prominent scientists to raise concerns about the environmental impact of human activity. His legacy includes his prolific writing on scientific and social issues, with The Malay Archipelago remaining highly regarded.

Did You Know?

• Wallace independently conceived the theory of evolution through natural selection; his 1858 paper was published alongside extracts from Darwin's writings.
• He identified the faunal divide now termed the Wallace Line, separating the Indonesian archipelago into Asian-origin and Australasian faunal regions.
• In 1864 he was the first to propose that during later human evolution natural selection acted primarily on mental faculties rather than physical form.
• His 1904 book Man's Place in the Universe was the first serious attempt by a biologist to evaluate the likelihood of life on other planets.

Notable Quotes (Wikiquote)

"Every species has come into existence coincident both in space and time with a pre-existing closely allied species." — Alfred Russel Wallace "On the Law which has Regulated the Introduction of New Species" (1855)." — Alfred Russel Wallace "Letter to Sir William Jackson Hooker, (1856 or earlier)." — Alfred Russel Wallace "On the Tendency of Varieties to Depart Indefinitely From the Original Type" (1858)." — Alfred Russel Wallace