The Nuttall Encyclopedia
The prescribed time, generally 40 days (hence the name), of non-intercourse with the shore for a ship suspected of infection, latterly enforced, and that very strictly, in the cases of infection with yellow fever or plague; since November 1896, the system of quarantine as regards the British Islands has ceased to exist.
Wood, James, ed. Entry for 'Quarantine'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/q/quarantine.html. Frederick Warne & Co Ltd. London. 1900.