Urban Ecology: An International Perspective on the Interaction Between Humans and Nature

to a Research Project Ernest W. Burgess Abstract The aggregation of urban population has been described by Bücher and Weber. A soc- logical study of the growth of the city, however, is concerned with the de nition and description of processes, as those of (a) expansion, (b) metabolism, and (c) mobility. The typical tendency of urban growth is the expansion radially from its central business district by a series of concentric circles, as (a) the central business district, (b) a zone of deter...