[Note 7: _Curtius_. Referring to the story of the Roman youth, Metius Curtius, who in 362 B.C. leaped into a chasm in the Forum, in order to save his country. The chasm immediately closed over him, and Rome was saved. Although the truth of the story has naturally failed to survive the investigations of historical critics, its moral inspiration has been effective in many historical instances.] [Note 8: _Party for the Derby_. Derby Day, which is the occasion of the most famous annual running race for horses in the world, takes place in the south of England during the week preceding Whitsunday. The race was founded by the Earl of Derby in 1780. It is now one of the greatest holidays in England, and the whole city of London turns out for the event. It is a great spectacle to see the crowd going from London and returning. The most faithful description of the event, the crowds, and the interest excited, may be found in George Moore's novel, _Esther Waters_ (1894).] [Note 9: _The deified Caligula_. Caius Caligula was Roman Emperor from 37 to 41 A. D. He was brought up among the soldiers, who gave him the name Caligula, because he wore the soldier's leather shoe, or half-boot, (Latin _caliga_). Caligula was deified, but that did not prevent him from becoming a madman, which seems to be the best way to account for his wanton cruelty and extraordinary caprices.] [Note 10: _Baiae_ was a small town on the Campanian Coast, ten miles from Naples. It was a favorite summer resort of the Roman aristocracy.] [Note 11: The _Praetorian Guard_ was the body-guard of the Roman emperors. The incident Stevenson speaks of may be found in Tacitus.]