Alfred Russel Wallace

Alfred Russel Wallace was born on January 8, 1823, in Usk, a small town in Monmouthshire on the Welsh border, the eighth of nine children of Thomas Vere Wallace and Mary Ann Greenell ^[1]. His father, trained in law but never practising it, drifted through failed investments and modest jobs, and the family's finances slid steadily downward through Alfred's childhood. When he was about five the Wallaces moved to Hertford, north of London, where the boy attended Hertford Grammar School until money ran out and he was withdrawn at fourteen ^[1].

Formal schooling ended there, and everything that followed was self-education. Wallace went to London to lodge with his older brother John, an apprentice builder, and in the evenings absorbed the lectures and pamphlets of the Owenite socialists at a working men's institute, an experience that shaped his radical politics for life ^[2]. Soon afterward he joined another brother, William, as an apprentice land surveyor. Through the late 1830s and early 1840s he tramped across the countryside of Wales and the English west, learning trigonometry and geology on the job while teaching himself botany from cheap field guides ^[1].

A brief spell as a schoolmaster in Leicester in 1844 proved decisive. There Wallace met Henry Walter Bates, a young hosier's clerk with a passion for beetles, and the two began collecting insects together. Reading Malthus on population, Darwin's account of the Beagle voyage, and the anonymous evolutionary tract Vestiges of the Natural History of Creation convinced Wallace that the origin of species was a solvable scientific problem, not a theological mystery ^[2].

In 1848 Wallace and Bates sailed for Brazil, planning to fund their research by selling duplicate specimens to collectors and museums through an agent in London. Wallace spent four years in the Amazon basin, much of it on the Rio Negro and its tributaries, mapping rivers, collecting birds and insects, and recording the customs and languages of indigenous peoples ^[3]. He noticed that closely related species were often separated by major rivers, an early hint of the geographical thinking that would define his career.

The expedition ended in catastrophe. On the voyage home in 1852 his ship, the brig Helen, caught fire in the mid Atlantic and sank with nearly all of his collections and notes. Wallace and the crew drifted in open boats for ten days before a passing vessel rescued them ^[3]. Back in London he salvaged what he could, publishing A Narrative of Travels on the Amazon and Rio Negro in 1853 along with a book on the region's palm trees, and he used the insurance payment on his lost specimens to plan a second, more ambitious journey.

From 1854 to 1862 Wallace travelled through the Malay Archipelago, the vast island world that is now Malaysia, Singapore, and Indonesia. Over eight years and some 14,000 miles of local travel he assembled roughly 125,000 specimens, including thousands of species new to science, among them birds of paradise that few Europeans had ever seen ^[4]. In 1855, while working in Sarawak on Borneo, he published a paper arguing that every species comes into existence closely associated in space and time with a pre-existing, closely allied species. This so-called Sarawak Law paper was his first public step toward an evolutionary theory ^[2].

The central event in any Alfred Russel Wallace biography came in early 1858. Lying feverish with malaria on the island of Ternate or nearby Gilolo in the Moluccas, Wallace recalled Malthus's argument about population pressure and suddenly grasped how a struggle for existence would preserve favourable variations and eliminate unfavourable ones. Within days he wrote out the idea in an essay, On the Tendency of Varieties to Depart Indefinitely from the Original Type, and mailed it to Charles Darwin, with whom he had been corresponding ^[5]. Darwin, who had been developing the same theory privately for twenty years, was stunned by the resemblance to his own thinking. On the advice of Charles Lyell and Joseph Hooker, Wallace's essay and extracts from Darwin's unpublished writings were read jointly before the Linnean Society of London on July 1, 1858, giving both men credit for the theory of natural selection ^[5]. Darwin's On the Origin of Species followed the next year.

Wallace never resented the arrangement, made without his knowledge while he was still in the tropics, and he later titled one of his own books Darwinism. Yet his independent achievements were substantial. His 1859 observations on the sharp faunal contrast between Bali and Lombok, and more broadly between the Asian and Australian sides of the archipelago, defined the boundary that Thomas Huxley named the Wallace Line ^[4]. His two-volume work The Geographical Distribution of Animals (1876) divided the world into zoogeographic regions still used in modified form today, and Island Life (1880) extended the analysis to oceanic and continental islands. For these works he is widely called the father of biogeography ^[6].

His narrative of the eastern journey, The Malay Archipelago (1869), became one of the most celebrated scientific travel books of the nineteenth century and has never gone out of print ^[4]. Among Alfred Russel Wallace achievements, scientists also count his contributions to the theory of warning coloration in animals, his discussion of what became known as the Wallace effect (the idea that natural selection can reinforce barriers to hybridization), and early, forceful warnings about deforestation and species loss. Honours accumulated late but generously: the Royal Society's Royal Medal in 1868, its Darwin Medal in 1890, the Copley Medal in 1908, and the Order of Merit the same year ^[1].

Wallace married Annie Mitten, daughter of the botanist and moss specialist William Mitten, in 1866, when he was 43 and she was 20. The couple had three children: Herbert, who died in childhood, and Violet and William, who survived their father ^[1]. Family life was affectionate but financially precarious. Wallace held no permanent salaried post, and poor investments consumed much of the money his specimen sales had earned. He supported his household through examining, writing, editing, and grading papers until 1881, when Darwin and Huxley successfully petitioned the government to grant him a civil list pension of 200 pounds a year ^[2].

His intellectual life ranged far beyond biology, sometimes to the alarm of his scientific friends. From the mid 1860s Wallace embraced spiritualism, attending seances and defending mediums in print, and he argued that natural selection alone could not account for the human mind, a position Darwin deplored ^[6]. He campaigned against compulsory smallpox vaccination, testifying before a royal commission in the 1890s, and he took prominent public stands as a socialist and as an advocate of land nationalization, serving as first president of the Land Nationalisation Society from 1881 ^[2]. He also wrote against eugenics and defended the intellectual capacities of the indigenous peoples he had lived among, views that set him apart from many Victorian contemporaries.

The last three decades of Wallace's life were among his most productive as an author. In 1886 and 1887 he made a lecture tour of the United States, speaking on Darwinism in Boston, Washington, and San Francisco and botanizing in the Rocky Mountains and the California sierras ^[1]. Back home he settled into a series of country houses in southern England, ending at Old Orchard, a house he designed himself at Broadstone in Dorset, where he gardened enthusiastically and kept up an enormous correspondence.

Books continued to flow: Darwinism (1889), a lucid defence and extension of natural selection; The Wonderful Century (1898), a survey of nineteenth-century successes and failures; Man's Place in the Universe (1903), an early scientific discussion of the likelihood of life on other planets; his two-volume autobiography My Life (1905); and The World of Life (1910), written in his late eighties ^[6]. In 1907 he published a book arguing against Percival Lowell's claim that Mars was crossed by artificial canals, using physical reasoning about the planet's temperature and atmosphere.

Wallace died at Old Orchard on November 7, 1913, at the age of 90 ^[1]. His family declined an offer of burial in Westminster Abbey, and he was buried in the small cemetery at Broadstone. Two years later a medallion bearing his name was placed in the Abbey near Darwin's grave ^[7].

For much of the twentieth century Wallace slipped into Darwin's shadow, remembered mainly as the man whose letter forced the Origin into print. Recent decades have reversed that neglect. Biographies, anthologies of his correspondence, and the centenary of his death in 2013 brought renewed attention, and a statue of Wallace by Anthony Smith was unveiled at the Natural History Museum in London that year, with the museum also mounting his portrait beside Darwin's ^[7]. The Wallace Correspondence Project has digitized thousands of his letters, and his collections remain working resources in museums in London, Oxford, and elsewhere ^[7].

His scientific fingerprints are everywhere in modern biology. The Wallace Line remains a fundamental concept in biogeography, and the transitional island region between Asia and Australia is now called Wallacea in his honour. Evolutionary biologists still debate and test the Wallace effect, conservationists cite his early warnings about tropical deforestation, and historians of science treat the joint Linnean Society reading of 1858 as one of the discipline's defining moments ^[5]. Among the standard Alfred Russel Wallace facts taught to students today is a simple one that he himself emphasized: a largely self-educated surveyor's apprentice, working alone in the forests of the tropics, arrived at one of the most consequential ideas in the history of science ^[6].