Francis Galton

Francis Galton (February 16, 1822 to January 17, 1911) was an English polymath who founded the eugenics movement, coining the word "eugenics" in 1883, and who in the course of arguing that human ability is inherited created much of modern statistics, including the concepts of correlation and regression. He was the half-cousin of Charles Darwin, sharing the grandfather Erasmus Darwin, and read Darwin's On the Origin of Species (1859) as a license to extend natural selection to the deliberate breeding of human beings. He pioneered fingerprint identification, composite photography, and anthropometric testing, founded the field of biometrics, introduced the phrase "nature versus nurture," and on his death left his estate to the University of London to endow a professorship of eugenics. He was knighted in 1909.¹²

Hereditary Genius and the Hereditarian Program

Galton's central conviction, that mental and moral capacity is fixed by heredity rather than shaped by circumstance, was set out in Hereditary Genius: An Inquiry into Its Laws and Consequences (1869). The book tabulated the relatives of judges, statesmen, scientists, poets, and other eminent men, found that distinction clustered in families, and concluded that "genius," meaning exceptionally high and inborn ability, ran in bloodlines the way physical traits did. Galton dismissed the rival explanation, that eminent families pass on advantages of wealth, education, and connection, and treated the statistical clustering of achievement as direct evidence of inherited mental power. He drew the policy inference openly, proposing that the human stock could be improved by encouraging the able to marry early and reproduce.²³

In English Men of Science: Their Nature and Nurture (1874) Galton introduced the antithesis "nature versus nurture" as a compact label for the question of whether inborn endowment or upbringing accounts for human differences, and he leaned consistently toward nature. He developed the twin study as a method for separating the two influences, comparing pairs raised together and apart, and read the results as confirmation of heredity's dominance. The same hereditarian premise, that differences in ability are innate, was shared by the twentieth-century race-and-intelligence researchers funded by the Pioneer Fund.²⁴

Coining Eugenics

Galton coined "eugenics" in Inquiries into Human Faculty and Its Development (1883), building the word from the Greek roots meaning "good in birth" or "well born." He defined it as the science of improving human hereditary qualities through selective reproduction, encouraging the propagation of the "fit" (positive eugenics) and discouraging that of the "unfit" (negative eugenics). The 1883 volume gathered some forty essays on the measurement of human faculties, including mental imagery, association, and sensory acuity, and presented the new science as the practical application of his hereditarian findings.¹⁵

Galton promoted eugenics as a secular faith for the educated classes, writing that it should be introduced into the national conscience "like a new religion." He funded a research office at University College London that in 1904 became the Eugenics Record Office and in 1907 was renamed the Francis Galton Laboratory of National Eugenics, and he served as honorary president of the Eugenics Education Society founded in 1907. His program supplied the template for the eugenics movements that spread through Britain, the United States, Germany, and Scandinavia in the first decades of the twentieth century, including compulsory sterilization laws and, later, the racial policies of the Third Reich.⁵⁶

Statistics, Biometrics, and Identification

The attempt to prove heredity statistically led Galton to invent tools that outlasted the cause they served. Studying the relationship between the heights of parents and their adult children, he found that the offspring of unusually tall or short parents tended to fall closer to the population average, a phenomenon he first called "reversion" and then "regression toward mediocrity," now known as regression to the mean. From the same data he developed the concept of correlation, a numerical measure of the degree to which two variables move together, which his protégé Karl Pearson formalized as the correlation coefficient. Galton set out this work in Natural Inheritance (1889), the founding text of biometrics, the statistical study of biological variation.²⁷

Galton opened an Anthropometric Laboratory at the International Health Exhibition in London in 1884, where for a small fee visitors had their height, weight, reaction time, grip strength, and sensory acuity measured and recorded, building a database of human variation. He placed fingerprint identification on a scientific footing in Finger Prints (1892), establishing that the ridge patterns are unique to each person and persist unchanged through life, devising a classification system, and amassing a collection that ran into the thousands of sets. He also invented composite photography, superimposing multiple portraits on a single plate to produce an averaged "type," a technique he applied in an effort to capture the supposed common features of criminals, the ill, and ethnic and family groups.⁴⁸

The Galton Bequest and University College London

Galton died in 1911 and left the residue of his estate to the University of London to fund a professorship of eugenics, expressing the wish that Pearson hold the first chair. The wish was honored, and Pearson became the inaugural Galton Professor, directing the combined Galton Laboratory and Biometric Laboratory at University College London. The Galton Chair and the laboratory carried his name for more than a century, and the eugenic research conducted under them shaped British social policy and the international eugenics movement through the interwar period.⁶⁹

University College London renamed the Galton Lecture Theatre and the Pearson Building and removed Galton's name from its buildings and a professorship in 2020, following an internal inquiry into the institution's history of eugenics, while the Galton Institute, the successor to the Eugenics Education Society, renamed itself the Adelphi Genetics Forum the same year. The bequest had by then funded generations of work in human genetics and statistics at the college, the discipline of biometrics having grown directly out of the apparatus Galton built to demonstrate that ability is bred rather than made.⁶⁹