As always, the weaker side of the critical propaganda is its effort at reconstruction. As in England, so in France, the faithful accused the critics of "pulling down without building up," when in point of fact their chief error was to build up--that is, to rewrite the history of human thought--before they had the required materials, or had even mastered those which existed. Thus Voltaire and Rousseau alike framed à priori syntheses of the origins of religion and society. But there were closer thinkers than they in the rationalistic ranks. Fontenelle's essay De l'origine des fables, though not wholly exempt from error, admittedly lays aright the foundations of mythology and hierology; and De Brosses in his treatise Du Culte des dieux fétiches (1760) does a similar service on the side of anthropology. Meister's essay De l'origine des principes religieux is full of insight and breadth; and, despite some errors due to the backwardness of anthropology, essentially scientific in temper and standpoint. His later essay, De la morale naturelle, shows the same independence and fineness of speculation, seeming indeed to tell of a character which missed fame by reason of over-delicacy of fibre and lack of the driving force which marked the foremost men of that tempestuous time. Vauvenargues's essay De la suffisance de la religion naturelle is no less clinching, granted its deism. So, on the side of philosophy, Mirabaud, who was secretary of the Académie from 1742 to 1755, handles the problem of the relation of deism to ethics--if the posthumous essays in the Recueil philosophique be indeed his--in a much more philosophic fashion than does Voltaire, arguing unanswerably for the ultimate self-dependence of morals. The Lettre de Thrasybule à Leucippe, ascribed to Fréret, again, is a notably skilful attack on theism.