Louis XV

Versailles was a palace of science, as Anna Ferrari shows in this stimulating and innovative study, accompanying a dazzling exhibition of the same title at the Science Museum, London (until 21 April). Soldiers were subjected to electricity experiments in the Galerie des Glaces. The king watched the dissection of an elephant or a horse in the Menagerie. The latest globes and clocks, microscopes and barometers, miracles of precision and beauty, were, and in some cases still are, on display in the royal apartments. The gardens were exercises in trigonometry and hydraulics as well as planting. Louis XV had the largest and most varied plant collection in Europe. On 19 September

In the middle of the 18th century, on the north side of the Palais Royal gardens in Paris, there stood a magnificent chestnut tree called the Tree of Cracow. In his presidential address to the American Historical Association in 2000, Robert Darnton explained that the name Cracow probably derived from the heated debates that took place in Paris during the War of the Polish Succession, but also from the French verb craquer: to tell dubious stories. News-mongers or nouvellistes de bouche, agents for foreign diplomats and curious members of the public gathered round the tree, which was at the heart of Paris’s news network, a nerve centre for transmitting information,