Helvétius, Claude Adrien, 91, 127, 212; his family and education, 176-8; life in Paris, 178-9; visits Voltaire, 180; relations with Montesquieu, 181; his charities, 182; assists Prince Charles Edward, 182-3; meets and marries Mlle. de Ligniville, 183-5; his life and good works at Voré, 185-92; his book ‘On the Mind,’ 192-4; effects of its publication, 195-9; his _salon_ in Paris, 199-200; visits England, 201-2; and Frederick the Great, 202; his book ‘On Man,’ 202-3; declining years, 203; death, 204; his work and position, 204-5 Helvétius, Madame (Mlle. de Ligniville), 183-92, 197, 199-200, 203-4, 212 Holbach, Baron d’, 53, 55, 56, 76-7, 155; his position in the eighteenth century, 118; and among Voltaire’s friends, 119; early life, 120-1; marriage, 121; _salon_ in the Rue Royale, 121-2; life and society at Grandval, 122-138; visit to England, 138-9; opinion of the English, 139-40; publishes ‘Christianity Unveiled,’ 140-1; and ‘The System of Nature,’ 141-4; its reception, 144-5; its philosophy, 145-6; publishes other books, 147; his last years and death, 148-9; his character in contrast to his book, 149 Holbach, Madame d’, 121, 123, 131, 136-7 Hope (Père Hoop), 123-4, 130 Houdetot, Madame d’, 125-6, 164-5 Hume, David, 55, 56, 83, 128, 182, 200, 201 ‘Imaginary Socrates, The’ (Galiani), 92 ‘Instincts and Habitual Tastes of Man, The’ (Galiani), 92 ‘Integral Calculus, Essay on’ (Condorcet), 269-70 ‘Introduction to the Knowledge of the Human Mind’ (Vauvenargues), 111 ‘Junius, Letter of, to William Pitt’ (Condorcet), 290-1 ‘Justice and Virtue, Letter on’ (Condorcet), 269 ‘Justification, The’ (Condorcet), 288, 289 La Harpe, Jean François de, 156, 264 Le Breton (publisher), 43, 48 Lespinasse, Mademoiselle de, 18-24, 27-28 ‘Literary Correspondence, The’ (Grimm and Diderot), 49, 53, 79, 150, 156-63, 170 Louis XV., 16-17, 69, 70, 83, 237, 239, 242, 246 Louis XVI., 224, 225, 226, 227, 228-9, 231-2, 233, 252-3, 260-1, 278, 280-3 Louis XVIII., 231 Malesherbes, 195, 231-2 ‘Man, On’ (Helvétius), 202-3, 204 Marie Antoinette, 225, 230-1, 232, 233, 245, 246, 253, 261-2, 274-5 Marmontel, Jean François, 112, 113, 127 Maurepas, Comte de, 224, 225, 226, 231 ‘Meditation on Faith’ (Vauvenargues), 103, 109, 111 Meister (Grimm’s helper), 163, 170 ‘Merit and Virtue, Essay on’ (Diderot), 39 ‘Mind, On the’ (Helvétius), 127, 193-9, 202-3, 204-5 Mirabeau, Gabriel Honoré, Comte de, 263 Mirabeau, Victor Riquetti, Marquis de, 97-8, 100-1 Molé (actor), 255 Molin, Doctor, 4, 11 ‘Money, Essay on’ (Galiani), 65, 67 Montesquieu, 181 Morellet, Abbé, 88-9, 125, 199-200, 208, 210 ‘Natural Son, The’ (Diderot), 56, 241 Necker (Jacques), 75-6, 227-8, 274 Necker (Madame), 52, 75-6 ‘Paper Money, Letter on’ (Turgot), 208 Paris-Duverney (financier), 240, 241, 243 ‘Philosophical Thoughts, The’ (Diderot), 39, 41