Supremacy of Mankind over the Earth.—Control over Subsistence the Condition.—Mankind alone gained that Control.—Successive Arts of Subsistence—I. Natural Subsistence; II. Fish Subsistence; III. Farinaceous Subsistence; IV. Meat and Milk Subsistence; V. Unlimited Subsistence through Field Agriculture.—Long Intervals of Time between them. 19 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 PART II. GROWTH OF THE IDEA OF GOVERNMENT. CHAPTER I. ORGANIZATION OF SOCIETY UPON THE BASIS OF SEX. Australian Classes.—Organized upon Sex.—Archaic Character of the Organization.—Australian Gentes.—The Eight Classes.—Rule of Marriage.—Descent in the Female Line.—Stupendous Conjugal System.—Two Male and Two Female Classes in each Gens.—Innovations upon the Classes.—Gens still Rudimentary. 49 CHAPTER II. THE IROQUOIS GENS. The Gentile Organization.—Its Wide Prevalence.—Definition of a Gens.—Descent in the Female Line the Archaic Rule.—Rights, Privileges and Obligations of Members of a Gens.—Right of Electing and Deposing its Sachem and Chiefs.—Obligation not to marry in the Gens.—Mutual Rights of Inheritance of the Property of deceased Members.—Reciprocal Obligations of Help, Defense and Redress of Injuries.—Right of Naming its Members.—Right of Adopting Strangers into the Gens.—Common Religious Rites, Query.—A Common Burial Place.—Council of the Gens.—Gentes named after Animals.—Number of Persons in a Gens. 62 CHAPTER III. THE IROQUOIS PHRATRY. Definition of a Phratry.—Kindred Gentes Reunited in a Higher Organization.—Phratry of the Iroquois Tribes.—Its Composition.—Its Uses and Functions.—Social and Religious.—Illustrations.—The Analogue of the Grecian Phratry; but in its Archaic Form.—Phratries of the Choctas.—Of the Chickasas.—Of the Mohegans.—Of the Thlinkeets.—Their Probable Universality in the Tribes of the American Aborigines. 88 CHAPTER IV. THE IROQUOIS TRIBE.