The cholera pandemic of the early 1830s hit France hard. It wiped out nearly 3% of Parisians in a month, and hospitals were overwhelmed by patients whose ailments doctors could not explain. The end of the plague prompted an economic revival, with France following Britain into an industrial revolution. But as anyone who has read “Les Misérables” knows, the pandemic also contributed to another sort of revolution. The city’s poor, hit hardest by the disease, fulminated against the rich, who had fled to their country homes to avoid contagion. France saw political instability for years afterwards.