Combining the histories of empire, leisure, tourism, culture, and medicine, Eric T. Jennings sheds new light on the workings of empire by examining the rationale and practice of French colonial hydrotherapy between 1830 and 1962. He traces colonial acclimatization theory and the development of a “science” of hydrotherapy appropriate to colonial spaces, and he chronicles and compares the histories of spas in several French colonies—Guadeloupe, Madagascar, Tunisia, and Réunion—and in France itself. Throughout Curing the Colonizers, Jennings illuminates the relationship between indigenous and French colonial therapeutic knowledge as well as the ultimate failure of the spas to make colonialism physically or morally safe for the French.