156 



Masuruni, where formerly a Dutch post was established * 

 opposite the Cano Tupuro. Crossing the Masuruni, the 

 boundary runs along the western banks of the Essequebo 

 and Rupunuri, as far as the point where the Cordillera of 

 Pacaraimo (4° of north latitude) gives a passage to the 

 Rio Rupunuri, which is a tributary stream of the Essequebo j 

 then, following the southern declivity of the cordillera of 

 Pacaraimo, which separates the waters of Caroni from those 

 ©f the Rio Branco, it goes successively toward the west, by 

 Santa Rosa (nearly lat. 3° 45', long. 65<> 20'), to the sources 

 of the Oroonoko, lat. 3° 40', long. 66° 10'?) $ toward the 

 S. W., to the sources of the Rio Mavaca and the Idapa 

 (lat. 2°, long. 68°), and, crossing the Rio Negro at the island 

 of San Jose (lat. 1° 38 7 , long. 69° 68 7 ) near S. Carlos del 

 Rio Negro; toward W. S. W., through plains entirely un- 

 known, to the Gran Salto del Yapura, or Caqueta, situate 

 near the mouth of the Rio de los Enganos (south lat. 0° 35 ') ; 

 and finally makes an extraordinary turn toward the S. E. at 

 the confluence of ,the Rio Yaguas with the Putumayo, or 

 I^a (south lat. 3° 5') ; the point where the Spanish and 



35 ; , according to other maps recently published. A ma- 

 nuscript map of the mouths of the Oroonoko in my posses- 

 sion gives but 25'. It results from these minute discus- 

 sions, that the longitude of the mouth of the Pomaroun is 

 between (50° 55' and 01° 20'. I here reiterate the wish I 

 have already expressed in another place, that the govern- 

 ment of Columbia may connect chronometrically, and by 

 an uninterrupted navigation, the mouth of the Essequebo, 

 Cape Nassau, Punta Barima (Old Guyana and Angostura), 

 the bocas chicas of the Oroonoko, Puerta Espana, and Punta 

 Galera, whichjs the north-east'cape of the island of Trinidad. 



* We must not confound this post with the ancient 

 Spanish post destacamento de Cuyuni), on the right branch of 

 the Cuyuni, at the confluence of the Curumu. 



