Beyond the Appalachian mountain wall, the once heavily forested land dips gently to the Mississippi; then the land rises again, in a long, treeless swell, up to the foot of the giant and picturesque Cordilleras. The isothermal lines in this great central basin are nearly identical with those of the Atlantic coast. The soil east of the 105th meridian west from Greenwich is generally rich, sometimes extremely fertile; and it is now agreed that nearly all the vast arid plains to the west of that meridian, formerly set down as desert, needs only irrigation to blossom as the rose. The Pacific slope, narrow and abrupt, abounds in fertile, pent-up valleys, with some of the finest scenery on the continent and a climate everywhere nearly equal at the same elevation; the isothermal lines here run north and south, the lofty mountain range materially influencing both climate and vegetation. Sidenote: Summary. There is no fairer land for the building of a great nation. The region occupied by the United States is particularly available for such a purpose. It offers a wide range of diversity in climate and products, yet is traversed by noble rivers which intimately connect the North with the South, and have been made to bind the East with the West. It possesses in the Mississippi basin vast plains unsurpassed for health, fertility, and the capacity to support an enormous population, yet easily defended; for the great outlying mountain ranges, while readily penetrated by bands of adventurous pioneers, and though climbed by railway trains, might easily be made serious obstacles to invading armies. The natural resources of North America are apparently exhaustless; we command nearly every North American seaport on both oceans, and withal are so isolated that there appears to be no necessity for "entangling alliances" with transatlantic powers. The United States seems permitted by Nature to work out her own destiny unhampered by foreign influence, secure in her position, rich in capabilities. Her land is doubtless destined to become the greatest stronghold of the Aryan race. 3. The Native Races. Sidenotes: The aborigines. Divisible into two divisions. When Europeans first set foot upon the shores of America it was found not only that a New World had been discovered, but that it was peopled by a race of men theretofore unknown to civilized experience. The various branches of the race differed greatly from each other in general appearance and in degrees of civilization, and to some extent were settled in latitudinal strata; thus the reports concerning them made by early navigators who touched at different points along the coast, led to much confusion in European estimates of the aborigines. We now know that but one race occupied the land from Hudson Bay to Patagonia. Leaving out of account the Carib race of the West Indies, the portion resident in North and Central America may be roughly grouped into two grand divisions:--