For three years the two worked night and day at the preliminaries of their scheme. In 1750 Diderot poured out, with the warmth and glow of a woman in love, the Prospectus and Plan of his work. The overwhelmingness of his enthusiasm had forced a privilege for it from the authorities. Also in 1750 appeared d’Alembert’s Preface, and the first volume was launched on the world. From this time until 1765 the history of Diderot and of the Encyclopædia is the same thing. For fifteen years he worked at it unremittingly through storm and sunshine. The idea possessed and dominated him. In a garret on the fifth floor in his lodging in the Rue Taranne, wrapped in an old dressing-gown, with wild hair, bare neck, and bent back, the message he must deliver through the Encyclopædia bubbled into his heart and went straight from his heart to his pen. ‘This thing will surely produce a great revolution in the human mind,’ he said of it in passionate exultation: ‘We shall have served humanity.’ For this Diderot, who disbelieved so loudly and truculently in God, believed hopefully in the improvement of human kind, and had for the race so vast and so generous a pity that he sacrificed to it the coarse pleasures his coarse nature loved, his time, his peace, his worldly advancement, his safety, and his friend. In 1752 a Royal Edict of matchless imbecility suppressed the first two volumes of the book, at the same time begging its promoters to continue to bring out others! Every year a volume appeared until 1757. The success of the thing was prodigious, and with reason, for it said what, so far, men had only dared to think. It gave the history, quite innocently, of the taxes--of _gabelle_, of _taille_, of _corvée_--and they stood ‘damned to everlasting fame;’ it showed the infamous abuses of the game-laws; it manifested the miracles of science. As by a magnet the genius of Diderot had drawn to him, as contributors, all the genius of France; while always at his side, co-editing, restraining his imprudence, yet working as he worked himself, was d’Alembert. And then, in 1759, came the great suspension. D’Alembert had written his famous article ‘Geneva,’ and that mad emotionalist, Jean Jacques Rousseau, in the most famous treachery in the history of literature, turned on the philosophic party in his Letter to d’Alembert ‘On Plays.’ The authorities of France united with insulted Calvinism and with Rousseau, and declared the Encyclopædia accursed and forbidden. That would have been bad enough; but there was yet one thing worse. Beaten down by storm and insult, d’Alembert fell back from the fray and left Diderot to fight the battle alone.