ABSTRACT
EVERY science, whatever its scope, has difficulty at the outset in determining the limits of its field. Each makes use of truths learned from older sciences and in turn contributes to them facts and general principles gained from its own specialized investigations. The complexity of man’s nature, his intimate relation to earth forces and to all living things ; and especially his reactions to his fellow-man and the influence of his past history upon present life, make all studies concerning him particularly difficult.
