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TO THE 



SECOND EDITION. 



In this Edition, the Sketch of the for- 

 mer state of South America has been 

 transferred from the Second Volume to the 

 First, and now forms the Seventh, instead 

 of the Twelfth Chapter ; an arrangement 

 more consistent with the course of the 

 narrative. 



A list of the ores and other minerals 

 collected on the coasts, and from various 

 mines in the interior, is added to the Ap- 

 pendix. 



A careful revision has also suggested a 

 few minor corrections and additions. 



Edinburgh, IQih April 1824, 



