This article discusses Walras' latest book, theMélanges d'économie politique et sociale. TheMélanges is a collection of unpublished material that was intended by Walras to appear as a book. The authors show that theMélanges is a valuable addition to the existing available work by Walras. At specific points theMélanges adds insights to Walras' pure, applied or social economics that otherwise would not have been obtained. The book, however, seems to be restricted to those readers acquainted already with Walras' theory.