THE POPULATION PROBLEM AMONG MEN 80
(1) The population problem among men has, owing to the evolution
of reason, assumed in both aspects a wholly different form. (2)
To follow the nature, causes, and results of these changes a
sketch is required of human evolution—especially of social
evolution. History only provides a partial record for a few
thousand years, and (3) we are thus dependent for social history
upon our knowledge of primitive races which may be applied to
prehistoric races. (4) Outline of future chapters.