Narrative of the surveying voyages of his majesty's ships Adventure and Beagle (vol.1): between the years 1826 and 1836 : describing their examination of the southern shores of South America, and the Beagles's circumnavigation of the globe

172 SUPPOSED GOLD DUST. May 1828. a bag-full on board to be tested. The shining substance proved to be, as I had supposed, the micaceous particles of disinte- grated granite. It was not our good fortune to discover streams similar to those sung of by the poet, " Whose foam is amber, and whose gravel gold."