The Granite Of Those Countries, Owing To The Position Of The Thin Laminae Of Black Mica, Sometimes Resembles Graphic Granite; But Most Frequently (And This Determines The Age Of Its Formation) It Passes Into A Real Gneiss.

Its beds, very regularly stratified, run from south-west to north-east, as in the Cordillera on the shore of Caracas.

The dip of the granite-gneiss is 70 degrees north-west. It is traversed by an infinite number of veins of quartz, which are singularly transparent, and three or four, and sometimes fifteen inches thick. I found no cavity (druse), no crystallized substance, not even rock-crystal; and no trace of pyrites, or any other metallic substance. I enter into these particulars on account of the chimerical ideas that have been spread ever since the sixteenth century, after the voyages of Berreo and Raleigh,* "on the immense riches of the great and fine empire of Guiana." (* Raleigh's work bears the high sounding title of The Discovery of the large, rich, and beautiful Empire of Guiana, London 1596. See also Raleghi admiranda Descriptio Regni Guianae, auri abundantissimi, Hondius Noribergae 1599.)

The river Atabapo presents throughout a peculiar aspect; you see nothing of its real banks formed by flat lands eight or ten feet high; they are concealed by a row of palms, and small trees with slender trunks, the roots of which are bathed by the waters. There are many crocodiles from the point where you quit the Orinoco to the mission of San Fernando, and their presence indicates that this part of the river belongs to the Rio Guaviare and not to the Atabapo.

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