CHAPTER III.

RATIO OF HUMAN PROGRESS.

Retrospect on the Lines of Human Progress.—Principal Contributions of Modern Civilization.—Of Ancient Civilization.—Of Later Period of Barbarism.—Of Middle Period.—Of Older Period.—Of Period of Savagery.—Humble Condition of Primitive Man.—Human Progress in a Geometrical Ratio.—Relative Length of Ethnical Periods.—Appearance of Semitic and Aryan Families. 29