First Appears A Narrow Wall Eighty Feet High, And Perpendicular; And At The Southern Extremity Of This Wall Are Two Turrets, The Courses Of Which Are Of Granite, And Nearly Horizontal.

The grouping of the rocks of Guanari is so symmetrical that they might be taken for the ruins of an ancient edifice.

Are they the remains of islets in the midst of an inland sea, that covered the flat ground between the Sierra Parime and the Parecis mountains?* (* The Sierra de la Parime, or of the Upper Orinoco, and the Sierra (or Campos) dos Parecis, are part of the mountains of Matto Grosso, and form the northern back of the Sierra de Chiquitos. I here name the two chains of mountains running from east to west, and bordering the plains or basins of the Cassiquiare, the Rio Negro, and the Amazon, between 5 degrees 30 minutes north, and 14 degrees south latitude.) or have these walls of rock, these turrets of granite, been upheaved by the elastic forces that still act in the interior of our planet? We may be permitted to meditate a little on the origin of mountains, after having seen the position of the Mexican volcanoes, and of trachyte summits on an elongated crevice; having found in the Andes of South America primitive and volcanic rocks in a straight line in the same chain; and when we recollect the island, three miles in circumference, and of a great height, which in modern times issued from the depths of the ocean near Oonalaska.

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