This mountain, from its inaccessible position beyond our frontier, and in the midst of lawless Afghan tribes, had long been the despair of geographers, but Major Holdich with a small survey party had at length succeeded in ascending it, and was said to have triangulated from its summit over an area of 50,000 square miles.

The remainder of the day I devoted to sketching and triangulating the country, while the horses were enjoying the benefit of the fine feed.

For exact measurements we depended on Topographer Hendriksen, who was due to triangulate Coropuna in the course of his survey along the 73d meridian.

While I was raising blisters and frightening oxen and flamingoes, Mr. Tucker triangulated the Parinacochas Basin, making the first accurate map of this vicinity.

Taking the whole series of them, Mr. Lowell very justly compares them to "a network which triangulates the surface of the planet like a geodetic survey, into polygons of all shapes and sizes.

We visited the falls of the creek, the waters of which tumble over the rocks and boulders for the distance of 200 yards from our camp, and then fall a distance of 110 feet, as triangulated by Mr. Hauser.

The lakes were triangulated by means of magnetic bearings as far as was practicable, in order to obtain their widths and general contour.

Its three principal lakes, viz, Pettiquaggamas, Petteiquaggamak, and Pohenagamook, were triangulated and sounded as exhibited by the maps of detail yet to be handed in of the operations of this division.