Rejecting, therefore, the idea of compilation by Peisistratus, and referring the present state of the Iliad and Odyssey to a period more than two centuries earlier, the question still remains, by what process, or through whose agency, they reached that state? Is each poem the work of one author, or of several? If the latter, do all the parts belong to the same age? What ground is there for believing, that any or all of these parts existed before, as separate poems, and have been accommodated to the place in which they now appear, by more or less systematic alteration? The acute and valuable Prolegomena of Wolf, half a century ago, powerfully turned the attention of scholars to the necessity of considering the Iliad and Odyssey with reference to the age and society in which they arose, and to the material differences in this respect between Homer and more recent epic poets.[271] Since that time, an elaborate study has been bestowed upon the early manifestations of poetry (Sagen-poesie) among other nations; and the German critics especially, among whom this description of literatures has been most cultivated, have selected it as the only appropriate analogy for the Homeric poems. Such poetry, consisting for the most part of short, artless effusions, with little of deliberate or far-sighted combination, has been assumed by many critics as a fit standard to apply for measuring the capacities of the Homeric age; an age exclusively of speakers, singers, and hearers, not of readers or writers. In place of the unbounded admiration which was felt for Homer, not merely as a poet of detail, but as constructor of a long epic, at the time when Wolf wrote his Prolegomena, the tone of criticism passed to the opposite extreme, and attention was fixed entirely upon the defects in the arrangement of the Iliad and Odyssey. Whatever was to be found in them of symmetry or pervading system, was pronounced to be decidedly post-Homeric. Under such preconceived anticipations, Homer seems to have been generally studied in Germany, during the generation succeeding Wolf, the negative portion of whose theory was usually admitted, though as to the positive substitute,—what explanation was to be given of the history and present constitution of the Homeric poems,—there was by no means the like agreement. During the last ten years, however, a contrary tendency has manifested itself; the Wolfian theory has been reëxamined and shaken by Nitzsch, who, as well as O. Müller, Welcker, and other scholars, have revived the idea of original Homeric unity, under certain modifications. The change in Goethe’s opinion, coincident with this new direction, is recorded in one of his latest works.[272] On the other hand, the original opinion of Wolf has also been reproduced within the last five years, and fortified with several new observations on the text of the Iliad, by Lachmann.