550 



notions of the course of the Oroonoko to the east 

 of the mission. This part of my itinerary map 

 differs entirely from those that preceded it. 

 I shall begin the description of this country 

 with the granitic group of Duida, at the foot of 

 which we sojourned. This group is bounded on 

 the west by the Rio Tamatama, and on the east 

 by the Rio Guapo. Between these two tributary 

 streams of the Oroonoko, amid the Morichales, 

 or clumps of mauritia palm-trees, which sur- 

 round Esmeralda, the Rio Sodomoni descends, 

 celebrated for the excellence of the pine apples 

 that grow upon it's banks. I measured on the 

 22d of May, in the savannah at the foot of 

 Duida, a base of four hundred and seventy-five 

 metres in length ; the angle under which the 

 summit of the mountain appeared at the dis- 

 tance of thirteen thousand three hundred and 

 twenty-seven metres, was still nine degrees. A 

 trigonometric measurement made with care 

 gave me for Duida (that is for the most elevated 

 peak, which is south-west of the Cerro Mara- 

 guaca) two thousand one hundred and seventy- 

 nine metres, or one thousand one hundred and 

 eighteen toises, above the plain of Esmeralda *. 



* Base directed toward the summit of Duida, four hun- 

 dred and seventy-five metres. Double angles of altitude at 

 the two extremities of the base 18° 0' 10", and 18° 38' 0", 

 Height of Duida above the base 2179 metres = 1118 toises 



