ninety-four feet lower than Quito, and is four leagues to the north-east of that city. "The quality, disposition, and lower situation, all contribute to render it less cold than Quito. Eastward it is defended by the lofty cordillera of Guamani and Pambamarca, and westward by that of Pichincha. The soil is entirely sand; so that besides the heat naturally resulting from the direct rays of the sun, it is increased by the rays being reverberated by the two cordilleras: hence it is also exposed to violent tempests of thunder, lightning, and rain. But being quite open towards the north and south, such dreadful whirlwinds form here that the whole interval is filled with columns of sand, carried up by the rapidity and gyrations of violent eddy winds, which sometimes produce fatal consequences; one melancholy instance happened while we were there—an Indian, being caught in one of these blasts, died on the spot. It is not indeed at all strange that the quantity of sand in one of these columns should totally stop all respiration in any living creature who has the misfortune of being involved in it."
The daily labour of the whole party was measuring the length of this plain in a horizontal direction, while the inequalities of the ground were at the same time corrected by means of a level. They commenced their task early in the morning, and, unless when interrupted by bad weather, or the too intense heat of the sun at noon, continued actively employed until the evening. The plain of Cazambe had first been made choice of; but after a short trial, during which M. Couplet, one of the French academicians, died suddenly, this position was abandoned. It was now determined, therefore, to continue the series of triangles to the south of Quito, and the whole company dividing itself into two parties, the one to which Don George Juan was attached proceeded to the mountain of Pambamarca, while Ulloa, La Condamine, and Bouguer climbed up to the highest summit
