Almost two decades ago, Professor Frederic C. Lane, assisted by Dr. Jelle C. Riemersma, prepared a book of readings in economic history, published in 1953, by Richard D. Irwin, Inc., under the title Enterprise and Secular Change. At that time I suggested the inclusion after translation of Arthur Spiethoff's article, “Die Allgemeine Volkswirtschaftslehre als geschichtliche Theorie: Die Wirtschaftsstile,” published in the Festgabe für Sombart in Schmollers Jahrbuch, LVI, No. 6 (1932), 51 fr. When Professor Spiethoff was informed of this suggestion, he refused to give the needed permission since his ideas on the subject had matured. Instead he sent an original article consisting of several sections, some of which I translated. Spiethoff's pertinent ideas were then published in translation in America in two separate papers. One, entitled “The ‘Historical’ Character of Economic Theories,” is to be found in the Journal of Economic History, XII (1952), 131 ff; the other, “Pure Theory and Gestalt Theory: Ideal Types and Real Types,” appeared in the Lane-Riemersma reader just cited. The rest of Spiethoff's original article remained untranslated. One section of it is now being submitted.