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" Nimis anxium te die circa verba 

 " et compofitionem, mi Lucili, nolo : 

 <c Habeo majoraque curas, que re quid 

 " fcribas non quem admodum — -~ 

 " Cujufcunque orationem videris folji^ 

 u citam et poiitam fcito animum quo- 

 " que non minus pufilius otCupatuiti,^ 



Concerning Foffils and Minerals, f 

 fhall only obferve, that above the Ca- 

 taracts of the river Demerary, there 

 are abundance of red and white Agates, 

 which remain untouched by the Na- 

 tives, who avoid them from a princi- 

 pie of fuperftitious veneration, as they 

 are dedicated to the fervice of their 

 magical * invocations, There are like- 

 wife a variety of ftones, which appear 

 to contain valuable ores, and there are 

 undoubtedly mines of gold and (liver* 

 fince the Spaniards have difcovered 

 C 3 feveraj 



