The Heat From Which We Suffered Is Not Entirely Owing To The Temperature Of The Air, But Is Produced By The Fine Sand Mingled With It; This Sand Strikes Against The Face Of The Traveller, As It Does Against The Ball Of The Thermometer.

I never observed the mercury rise in America, amid a wind of sand, above 45.8 degrees centigrade.

Captain Lyon, with whom I had the pleasure of conversing on his return from Mourzouk, appeared to me also inclined to think that the temperature of fifty-two degrees, so often felt in Fezzan, is produced in great part by the grains of quartz suspended in the atmosphere. Between Pao and the village of Santa Cruz de Cachipo, founded in 1749, and inhabited by five hundred Caribs, we passed the western elongation of the little table-land, known by the name of Mesa de Amana. This table-land forms a point of partition between the Orinoco, the Guarapiche, and the coast of New Andalusia. Its height is so inconsiderable that it would scarcely be an obstacle to the establishment of inland navigation in this part of the Llanos. The Rio Mano however, which flows into the Orinoco above the confluence of the Carony, and which D'Anville (I know not on what authority) has marked in the first edition of his great map as issuing from the lake of Valencia, and receiving the waters of the Guayra, could never have served as a natural canal between two basins of rivers. No bifurcation of this kind exists in the Llano. A great number of Carib Indians, who now inhabit the missions of Piritu, were formerly on the north and east of the table-land of Amana, between Maturin, the mouth of the Rio Arco, and the Guarapiche. The incursions of Don Joseph Careno, one of the most enterprising governors of the province of Cumana, occasioned a general migration of independent Caribs toward the banks of the Lower Orinoco in 1720.

The whole of this vast plain consists of secondary formations which to the southward rest immediately on the granitic mountains of the Orinoco. On the north-west they are separated by a narrow band of transition-rocks from the primitive mountains of the shore of Caracas. This abundance of secondary rocks, covering without interruption a space of more than seven thousand square leagues,* is a phenomenon the more remarkable in that region of the globe, because in the whole of the Sierra da la Parima, between the right bank of the Orinoco and the Rio Negro, there is, as in Scandinavia, a total absence of secondary formations. (* Reckoning only that part of the Llanos which is bounded by the Rio Apure on the south, and by the Sierra Nevada de Merida and the Parima de las Rosas on the west.) The red sandstone, containing some vestiges of fossil wood (of the family of monocotyledons) is seen everywhere in the plains of Calabozo: farther east it is overlaid by calcareous and gypseous rocks which conceal it from the research of the geologist.

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