The London of the eighteenth century was an aristocratic world, which lived to itself, which displayed the virtues and developed the vices of an aristocracy which was under little fear of external control or check; which had emancipated itself from the control of the crown; which had not fallen under the control of the _bourgeoisie_; which saw its own life, and saw that, according to its own maxims, it was good. Public opinion now rules, and it is an opinion which constrains the conduct, and narrows the experience, and dwarfs the violence, and minimises the frankness of the highest classes, while it diminishes their vices, supports their conscience, and precludes their grossness. There was nothing like this in the last century, especially in the early part of it. The aristocracy came to town from their remote estates,—where they were uncontrolled by any opinion or by any equal society, and where the eccentricities and personalities of each character were fostered and exaggerated,—to a London which was like a large county town, in which everybody of rank knew everybody of rank, where the eccentricities of each rural potentate came into picturesque collision with the eccentricities of other rural potentates, where the most minute allusions to the peculiarities and the career of the principal persons were instantly understood, where squibs were on every table, and where satire was in the air. No finer field of social observation could be found for an intelligent and witty woman. Lady Mary understood it at once.