The line between science and law blurred dramatically in the landmark 1893 Supreme Court case Nix v. Hedden. The conflict arose from the Tariff Act of 1883, which imposed a ten percent import duty on foreign vegetables while allowing foreign fruits to enter American ports completely tax-free.
John Nix, a prominent New York produce merchant, imported a massive shipment of West Indian tomatoes and was promptly taxed by Edward Hedden, the Collector of the Port of New York. Nix filed a lawsuit to recover the paid duties, presenting a deceptively simple botanical argument: because tomatoes develop from the ovary of a flowering plant and contain seeds, they are biologically fruits and should be exempt from taxation. During the legal proceedings, both sides introduced dictionary definitions for fruits and vegetables into evidence, calling produce merchants as expert witnesses to testify on industry terminology.
Justice Horace Gray delivered the unanimous opinion of the Court, acknowledging that while tomatoes are botanically classified as the fruit of the vine, the law must interpret language according to its common, everyday usage. The Court noted that in the popular mind, tomatoes are served during the main meal alongside meat or fish, unlike culinary fruits which are traditionally eaten as dessert. By prioritizing culinary customs over scientific taxonomy, the Supreme Court officially classified the tomato as a vegetable for legal and trade purposes.
This precedent still echoes today, reminding legal scholars that statutory interpretation often prioritizes everyday human convention over strict scientific categorization.