The first issue of theDécade philosophiqueappeared on 29 April 1794. In all, fifty-four volumes of the journal were published between that date and 1807, when, on Napoleon's orders, it was forced to merge with theMercure français. TheDécadewas published three times a month (taking its name from its appearance on the tenth day of each month of the French republican calendar) and the periodical soon became one of the intellectual powerhouses of the French republic after Robespierre. But quite what, in this particular setting, an intellectual powerhouse might have been is still an open question. Alongside Immanuel Kant or Jeremy Bentham, and their vast and varied intellectual legacies, the significance of the dozens of writers, including Pierre-Jean-Georges Cabanis, Pierre-Samuel Dupont de Nemours and Jean-Baptiste Say, who contributed to theDécade, is now more difficult to specify. There have, of course, been several fine studies of theDécadeand its contributors, notably by Joanna Kitchen and Marc Régaldo, and more broadly by Sergio Moravia, Martin Staum and Cheryl Welch. But it is still somewhat easier to associate the periodical with a number of keywords, such asidéologieandscience sociale, than with anything comparable to those more comprehensively articulated bodies of thought that came to be labelled “idealism” or “utilitarianism”. “Ideologism” never seems to have existed, and certainly never caught on. But this very indeterminacy may still be an advantage. It may help to open up, both historically and analytically, rather more of the intellectual space once covered by the broad range of subjects and arguments that first helped to shape—and then came to be buried by—idealism and utilitarianism.