FORMS OF POPULATION MOVEMENT: PROLEGOMENA TO A STUDY OF MENTAL MOBILITY.

The article discusses about various forms of population movement. Human beings may be so scattered that they range through an area of two hundred square miles per capita, and they may be so crowded that they are cooped in much less than one one-thousandth of a square mile per capita. A variation so great as this would certainly make a difference in the types of social change correlated with movement within the several areas, and when one takes into account the manifold possibilities of movement between thinly and thickly settled regions, such quantitative inequality looms up as an element in movement that may mean a great deal in specific cases. Another category under which movement may be placed has to do with the relative complexities of the culture areas at the point of departure and the point of arrival. The type and extent of social change occurring in correlation with any given movement is influenced by the relative complexity, relative simplicity, or dissimilarity of the areas involved.