KEBOH HILL-RANGE 
high. Buritys were innumerable along a small stream 
— the Rio Estivado — flowing southwest into the Cubaya 
River. There were great quantities of mangabeira trees. 
We proceeded northward along a chapada, a capital 
Brazilian name which denotes a locality that is neither a 
forest nor a prairie. The chapada had scanty trees and 
scrub, but not enough to make it into a forest. 
We were marching over low hills with surface deposits 
of sand and cinders. We gradually reached an elevation 
of 1,050 feet some eighteen kilometres from camp, and 
shortly after, and only fifty feet lower, entered a refresh¬ 
ing grove of giant palmeiras and buritys along the Rio 
das Porcas, flowing westward. There, north of the 
stream, we went across more clean campos, 1,700 metres 
wide, bounded to the north by the thickly wooded hill- 
range Keboh, extending before us from east to west. 
We crossed this range in the centre, during a strong 
gale from the southwest. The wind cleared the sky, that 
had been overcast and had made the atmosphere heavy* 
Again that afternoon, when the wind ceased, I noticed the 
peculiar striations in the sky — not in straight lines that 
time, but in great and most regular curves converging to 
the west. 
The valley became narrower as we went along. Two 
twin, conical hills ended the northern extremity of the 
range (southeast to northwest) which we had on our left 
— a great mass of granite blocks in the centre of the plain 
rising higher and higher into regular domes. The plain 
itself, on an incline, showed two swellings of great mag¬ 
nitude, the one to our right about 120 feet higher than the 
plain, the elevation of which was 1,000 feet. On the west 
side of those two swellings was a confused mass of huge 
blocks of granite, of all sizes and shapes, which to all 
appearances had been shot up from underneath by some 
internal force. They were outwardly much blackened by 
the action of fire, but internally were of a grey tint. A 
3 55 
