Each formation or ecological organization within a community serves as a selective or magnetic force attracting to itself appropriate population elements and repelling incongruous units, thus making for biological and cultural subdivisions of a city’s population. Everyone knows how racial and linguistic colonies develop in all of our large cities, but the age and sex segregations which take place are not quite so obvious to common perception. In the city of Seattle, which has in general a sex composition of 113 males to 100 females, the downtown district, comprising an area inscribed by a radius of half a mile or so, has from 300 to 500 males to every 100 females. But in the outlying districts of the city, except in one or two industrial sections, these ratios are reversed. Females predominate in numbers over males in all the residential neighborhoods and in the suburbs of the city. This same condition is true with regard to the age distribution of population. The school census shows an absolute decline in the number of children of school age in the central districts of the city although the total population for this area has shown an increase for each decade. It is obvious, then, that the settler type of population, the married couples with children, withdraw from the center of the city while the more mobile and less responsible adults herd together in the hotel and apartment regions near the heart of the community. This process of population-sifting produces not only increasing mobility with approach from the periphery to the center of the formation, but also different cultural areas representing different mores, attitudes, and degrees of civic interest. The neighborhoods in which the settler type of population resides, with their preponderance of women and children, serve as the custodians of the stabilizing and repressive mores. It is in the Seattle neighborhoods, especially those on the hill-tops, that the conservative, law-abiding, civic-minded population elements dwell. The downtown section and the valleys, which are usually industrial sites, are populated by a class of people who are not only more mobile but whose mores and attitudes, as tested by voting habits, are more vagrant and radical. R. D. MCKENZIE CHAPTER IV THE NATURAL HISTORY OF THE NEWSPAPER I. THE STRUGGLE FOR EXISTENCE The newspaper has a history; but it has, likewise, a natural history. The press, as it exists, is not, as our moralists sometimes seem to assume, the wilful product of any little group of living men. On the contrary, it is the outcome of a historic process in which many individuals participated without foreseeing what the ultimate product of their labors was to be.