ABSTRACT
The study of certain differential phenomena, such as mortality or fertility, leads to consideration of populations defined by religious, social, economic, or professional membership. Interesting information concerning a population can be obtained only after certain structural characteristics are established. The pyramid of 1775 is that of a population characterized by high natality and high mortality: a broad base and a rapid narrowing. In such a population, natality and mortality are not far from being in balance, so that the total population varies little, as does the annual number of births. The economically active agricultural population is recruited almost exclusively from among children of farmers; the occupational activity begins quite early, and the population is quite diminished by occupational migration.
