North America divided into two vast regions, one inclining toward the Pole, the other toward the Equator.—Valley of the Mississippi.—Traces of the Revolutions of the Globe.—Shore of the Atlantic Ocean, where the English Colonies were founded.—Difference in the Appearance of North and of South America at the Time of their Discovery.—Forests of North America.—Prairies.—Wandering Tribes of Natives.—Their outward Appearance, Manners, and Language.—Traces of an Unknown People.