| Status of Civilization (from Morgan, Ancient Society, 1877) | |
| I. Lower Status of Savagery | From the Infancy of the Human Race to the commencement of the next Period. |
| II. Middle Status of Savagery | From the acquisition of a fish subsistence and a knowledge of the use of fire … |
| III. Upper Status of Savagery | From the Invention of the Bow and Arrow … |
| IV. Lower Status of Barbarism | From the Invention of the Art of Pottery … |
| V. Middle Status of Barbarism | From the Domestication of animals on the Eastern hemisphere, and in the Western from the cultivation of maize and plants by Irrigation … |
| VI. Upper Status of Barbarism | From the Invention of the process of Smelting Iron Ore, with the use of iron tools … |
| VII. Civilization | From the Invention of writing, to the present time. |