D URING the past two decades there has been a developing emphasis in American social theory on the description of and processes of social change. From the mass of material already accumulated a picture of related changing elements is emerging, the details of which are in many respects quite different from popular conceptions. If nothing more had been accomplished than to show this discrepancy, the effort expended on these descriptive studies of change would have been justified. But from this interest there has also come a significant accretion to the methods of social studies. Preoccupation with trends and sequences has often proved no bad discipline for training in a sharper definition of the problem and of the units, where measurement was involved. Latterly, methods for recording some of the more subtle aspects of culture change have been tentatively put forward. Early studies of content of the newspaper, books, periodicals, motion pictures, and radio were not conceived in terms of trends of content but were concerned with problems of sampling, of classification, of units of measurement. Yet it is in showing changes by titne sequences that these studies may be most meaningful. For example, one may question whether column-inch records provide the most significant unit of measurement of newspaper content, maintaining that position in the paper, quality of writing, the appeal of special features, etc., may be more important than space, and yet be quite willing to grant that from a series of such column-inch measurements significant changes may be noted. Before turning to a study of a series, based on the time given to different types of radio programs from I9`5 tO I935, we may review briefly the development of various types of studies of content. Of the many organized but non-quantitative studies of the content of media of communication there are the various services summarizing news; resumes of particular sections of the newspaper; historical studies of the newspaper for a special content, such as Irene C. Willis' England's Holy War; the content of different classifications of books such as reviews of family folkways and mores as portrayed in contemporary novels; or surveys of content of textbooks as in the work of Bessie L. Pierce, Donald R. Taft or Prof. C. J. H. Hayes' volume on France;' the study of the language forms of sections of the newspaper or the radio; and many other types of analysis. But we may limit our interest here to the quantitative studies of content. (i) The most extensive list of such studies deals with the subject matter of the newspapers. The larger question is, of course, the influence of the newspaper content on the readers and the way in which known reader attitudes affect the presentation of news. However, until very recently there had been no, experimental attempt to measure such influences. Some of the problems of a program of research in this field have recently been indicated by J. L. Woodward.2 On the other hand, con-