Francis Galton published Finger Prints in London, providing the first systematic scientific proof that fingerprints were unique to individuals and remained unchanged throughout life. Drawing on data from thousands of subjects, Galton established the statistical basis for fingerprint identification and developed a classification system. His work built on earlier observations by William Herschel in India and Jan Evangelista Purkyně, and directly enabled the adoption of fingerprinting as a forensic identification tool by police forces beginning in Argentina and Britain in the 1890s.

Galton's fingerprint research arrived at the height of the Victorian detective fiction boom and reinforced the literary archetype of the scientific investigator who reads invisible traces. The fingerprint as symbol of irreducible individual identity became a potent metaphor in late Victorian and Edwardian literature, deployed by writers from Kipling to Collins. It also underpinned the eugenicist ideology that Galton promoted — a connection that haunts discussions of scientific evidence and racial profiling in twentieth-century poetry and fiction.