607 



chain, from Cerro del Chuao, and the meridian 

 of Choroni, as far as Cape Codera ; and in the 

 southern chain, from the meridian of Guigue, 

 to the mouth of the Rio Tuy. Cape Codera, 

 (Vol. iii, p. 375), the great mass of the Silla, of 

 Galipano, and the land between Guayra and 

 Caraccas (Vol. iii, p. 417, 520, 527, 528, 532), 

 the table-land of Buenavista (Vol. iv, p. 74), the 

 islands of the lake of Valencia (Vol. iv, p. 161, 

 168, 177), the mountains between Guigue, Ma- 

 ria Magdalena, and the Cerro de Chacao (Vol. 

 ii, p. 273, 277), are composed of gneiss P ; yet 

 amidst this soil of gneiss, inclosed micaslate re- 

 appears, often talquous in the Valle de Cauri- 

 mare, and in the ancient Provincia of los Ma- 

 riches (Vol. iii, p. 531) ; at Cabo Blanco, west 

 of la Guayra (Vol. iii, p. 402) ; near Caraccas 

 and Antimano (Vol. iv, p. 59, 60), and above all, 

 between the table-land of Buenavista^ and the 

 vallies of Aragua, in the mountain of the Co- 

 cuyzas and at Hacienda del Tuy (Vol. iv, p. 78, 

 91). Between the limits which we have here 

 assigned to gneiss, as a predominant rock (long. 

 68i° — 70f°), gneiss passes sometimes to mica- 



* I have been assured that the islets Orchila and Los 

 Frailes are also composed of gneiss. Curasao and Bonaire 

 are calcareous. Is the island of Oruba, in which pepites of 

 native gold of a considerable size have lately been founds 

 primitive ? 



