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Thermometrical observations, made at the same heights and in the same latitudes, render it probable that, at the Pejual of the Silla, one thousand toises above the Caribbean Sea, the mean temperature of the air is still 17 or 18 degrees; and that the thermometer keeps, in the coolest season, between 15 and 20 degrees in the day, and in the night between 10 and 12 degrees. At the hospital of St.
As the degrees progressively diminished towards the south, but much more towards the middle than towards the extremities, the middle of the whole arc was taken; and, on comparing it with the degrees measured at Peru, between the years 1737 and 1741, the ellipticity of the earth was concluded to be 1/334 the mean degree, 57008 toises; and the METRE, which is the ten-millionth part of the quarter of the meridian, 443.296 lines of the old French toise which had been used at Peru.
According to the law of the decrement of heat, three hundred and fifty toises in height produce in this latitude only three or four degrees difference in temperature. The heat which overpowers the traveller on his entrance into Santa Cruz, or La Guayra, must consequently be attributed to the reverberation from the rocks, against which these towns are built.
At a hundred toises distance from the auriferous quartz, the gneiss resumes its ordinary situation, hor 3 to 4, with 60 degrees dip to the north-west. A few strata of gneiss abound in silvery mica, and contain, instead of garnets, an immense quantity of small octohedrons of pyrites.
The crystals, perfectly transparent, were solitary, and often three or four toises distant from each other. We reposed at the foot of the cavern whence those flames were seen to issue, which of late years have become more frequent.
In both cases, what is probably meant is, that to eat or drink is to return no more from these mysterious abodes; and it may be to the intent to obviate any such consequence that Saint Peter, in sending a certain king's son down through a black and stinking hole a hundred toises deep underground, in a Gascon tale, to fetch Saint Peter's own sword, provides him with just enough bread in his wallet every morning to prevent his bursting with hunger.
Cape Verd is a peninsula about five leagues and a half long; the breadth is extremely variable. At its junction, with the continent, it is about four leagues broad; by the deep recess which the Bay of Daccard forms, it is reduced, near that village, to 600 toises, and becomes broader afterwards.
The part nearest the river is only one hundred and forty or one hundred and sixty toises high; but from its abrupt declivities, its situation in the midst of a savannah, and its rocky summits, cut into shapeless prisms, the Serrania appears singularly elevated. Its greatest breadth is only three leagues.
If, from the effect of some peculiar attraction, the waters of the Atlantic were to rise fifty toises at the mouth of the Orinoco, and two hundred toises at the mouth of the Amazon, the flood would submerge more than the half of South America. The eastern declivity, or the foot of the Andes, now six hundred leagues distant from the coast of Brazil, would become a shore beaten by the waves.
Farther to the west, at Cerro del Cuchivano, the chain of mountains seems as if broken by the effects of an earthquake. The crevice is more than a hundred and fifty toises wide, is surrounded by perpendicular rocks, and is filled with trees, the interwoven branches of which find no room to spread. This cleft appears like a mine opened by the falling in of the earth.
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