Most of the _salons_ may be exhaustively described as having been nourished on a little _eau sucré_ and a great deal of wit. But to this one wit alone was light, food, and air. Mademoiselle did not require to give dinners like Madame Necker, or suppers like Madame du Deffand; neither for the beauty which, later, was to make men forgive the mental limitations of Madame Récamier, had she need or use. Tall, pale, and slender, with her infinite, unconscious tact, her mental grace, and her divine sympathy, her passage through the social life of her age has left the subtle perfume of some delicate flower. To be her friend was to feel complete, understood, satisfied. To her, as to a sister of consolation, came Condorcet, marquis, mathematician, philosopher; Saint-Pierre, the pupil of Rousseau and the creator of ‘Paul and Virginia;’ La Harpe, whom she was to help to the Academy; Hénault, whom she had charmed from Madame du Deffand; Turgot, Chastellux, Marmontel. And quietly effacing himself, with that true greatness which is never afraid to be made of little account, was Mademoiselle’s lover and the noblest intellect of them all, d’Alembert. There is no more delightful trait in his character than this exquisite talent for modesty. With his spare form always dressed from head to foot in clothes of one colour, the aim of d’Alembert was both physically and mentally, as it were, to escape notice. True, when he talked, the listener must needs marvel at the breadth, the variety, the exhaustless interests of the mind, and its perfect simplicity and straightforwardness. But he did not want to talk much. He liked better to listen. He preferred in society, as he preferred in life, to think while other men said and did. No social pleasures could either supersede the work of his life, or make compensation for the sorrows of his soul. He had already thrown in his lot with Mademoiselle when he published the most daring of all his books, ‘The History of the Destruction of the Jesuits.’ Her treachery had shattered his life for five years, when he asked Frederick the Great for a sum of money which would enable him to travel and heal his broken health and heart. In 1770, with young Condorcet for his companion, he left Paris for Italy, stopped at Ferney, and spent his whole leave of absence with Voltaire.