Furthermore, June and July are the best months for exploration in the eastern slopes of the Andes in the upper Amazon Basin, the lands "behind the Ranges."

A little over a century ago, our great-grandfathers were reading in their school geographies that North America had no conspicuous mountains except the Alleghanies; and these mountains and the Andes of South America were believed to be one and the same chain, interrupted by the Gulf of Mexico.

First, however, it was necessary for us to go to Cotahuasi, the capital of the Province of Antabamba, and meet Dr. Bowman and Mr. Hendriksen, who had slowly been working their way across the Andes from the Urubamba Valley, and who would need a new supply of food-boxes if they were to complete the geographical reconnaissance of the 73d meridian.

The prefect insisted that the ruins represented the residence of the Inca Manco and his sons, who had sought refuge from Pizarro and the Spanish conquerors of Peru in the Andes between the Apurimac and Urubamba rivers.

It runs from west to east, from the sunset to the sunrise, from the Andes to the Atlantic.

In the beginning of 1818, captain Miller set out for the army of San Martin, and crossed the Andes by the pass of Uspallata.

To cross the Andes on mule-back along the regular routes is a feat comparable to the feats of the energetic tourists who by thousands traverse the mule trails in out-of-the-way nooks of Switzerland.