Latitude 11 to 16 degrees. Mountains of Nicaragua and Guatimala; line of volcanoes north 50 degrees west, for the most part still burning, from the gulf of Nicoya to the volcano of Soconusco.
Latitude 16 to 18 degrees. Mountains of gneiss-granite in the province of Oaxaca.
Latitude 18 1/2 to 19 1/2 degrees. Trachytic knot of Anahuac, parallel with the Nevados and the burning volcanoes of Mexico.
Latitude 19 1/2 to 20 degrees. Knot of the metaliferous mountains of
Guanaxuato and Zacatecas.
Latitude 21 3/4 to 22 degrees. Division of the Andes of Anahuac into three chains:
Eastern chain (that of Potosi and Texas), continued by the Ozark and
Wisconsin mountains, as far as Lake Superior.
Central chain (of Durango, New Mexico and the Rocky Mountains), sending on the north of the source of the river Platte (latitude 42 degrees) a branch (the Black hills) to north-east, widening greatly between the parallels 46 and 50 degrees, and lowering progressively as it approaches the mouth of Mackenzie River (latitude 68 degrees).
Western chain (of Cinaloa and Sonora). Linked by spurs to the maritime
Alps, or mountains of California.
We have yet no means of judging with precision the elevation of the Andes south of the knot of the mountains of Loxa (south latitude 3 degrees 5), but we know that on the north of that knot the Cordilleras rise five times higher than the majestic elevation of 2600 toises:
In the group of Quito, 0 to 2 degrees south latitude (Chimborazo,
Antisano, Cayambe, Cotopaxi, Collanes, Yliniza, Sangay, Tungurahua.)