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POSTSCRIPT. 



Letters have been received by the Geographical 

 Society from Mr. Schomburgk, by which it ap- 

 pears that he had explored the river Takutu to its 

 source, in about 1° 45' N. Lat. The Takytu is a 

 tributary of the Eio Branco, into which it falls at 

 San Joachim ; and its source is so far to the east- 

 ward, that ]Mr. Schomburgk procured bearings of 

 his old acquaintance, the Wauguwai and Amucu 

 Mountains, near the junction of the Yuawauri with 

 the Essequibo. The highest mountains are gra- 

 nitic, with masses of quartz, but no igneous rocks 

 were seen. Mr. Schomburgk has made observa- 

 tions on the magnetic intensity at Waraputa, at 

 Pirara, and near the sources of the Takutu, &c. 

 One of the silver medals of the Societe de Geo- 

 graphie of Paris has been awarded to Mr. Schom- 

 burgk for his researches in Guiana. 



