Generation after generation with but minor variations, the drama was repeated in Oxford's pubs. Students bending the elbow in a taproom would hear a sudden whispered warning, scuttle for the back exits. The slow were overtaken by hard-breathing "bullers" (bowler-hatted, black-coated Oxford cops) who tipped their hats and inquired "Are you a member of the university, sir?" After the inevitable admission, the guilty were led to a solemn and unhurried figure standing nearby in cap & gown—a university proctor—who demanded "Name and college, sir?"
Next day, in dark suits, white bow ties and black gowns, the culprits would present themselves at the...