Living Matter Contains a Special Vital Force That Chemistry Cannot Explain

Vitalism appeared in Britannica's biology and chemistry entries as a semi-respectable metaphysical principle, a way of preserving the mystery and dignity of life in an increasingly materialist age. The doctrine held that organic substances possessed properties inaccessible to lifeless chemistry, and that the organisation of living beings reflected an immaterial organising principle. The turning point came in 1828 when Friedrich Wöhler synthesised urea, an organic compound found in animal urine, from purely inorganic starting materials (ammonium cyanate). This result didn't immediately demolish vitalism, some vitalists claimed urea was a special case, but it opened the floodgates. As 19th-century chemists accumulated successful syntheses of organic compounds, vitalism became increasingly untenable. By the 1860s–1880s, Britannica's chemical entries reflected a new consensus: organic chemistry operated under the same laws as inorganic chemistry, and the vital principle was relegated to philosophy rather than science. Life's complexity emerged from ordinary chemical dynamics, not from any special force, a profound philosophical shift captured in Britannica's evolving lexicon.