E. B. White once said, only places that are a bit decadent are pleasant to live in. Charm, especially Philadelphia charm, wouldn't be the same without the tinge of decadence found in the lives of Philadelphia's upper class. The Perennial Philadelphians tells the story of the city's inherited aristocracy--of Wanamakers and Drexels, of Biddles and Cadwaladers. Drawing on history, genealogy, politics, economics, the fine arts, private diaries, and the impressions and anecdotes of myriad living witnesses, Nathaniel Burt paints a fascinating portrait of Old Philadelphians. He traces the...