ABSTRACT
The phenomena of population constitute the domain of a special science, demography, which was one of the earliest of the modern social sciences to emerge. It played an important part, in the eighteenth century, in stimulating the growth of other social sciences, and it has remained closely associated with sociology. For the demographer, as soon as he goes beyond measurement and calculation to study the causes or consequences of population changes, differential fertility and mortality, and similar problems, enters the domain of sociology. The most interesting demographic problems have always involved social factors of the kind with which sociology is concerned.
