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Show RYPSOMETRIC ADDENDA. I AM indebted to Mr. Pentland (whose scientific labours have thrown so much light on the geology and geography of Bolivia) for the following determinations, which he communicated to me in a letter written from Paris, in October, 1848, after the publication of his great map :- N evado of Sora.ta, or Long. from Height in Ancohuma.. S.lo.t. Greenwich. English Feet. South Peak- - - - 15° 51' 3311 68° 331 5511 21,286 North Peak- - 15° 491 18" 68° 83' 52" 21,043 Dli.mani. South Peak- - - 16° 381 5211 67° 49' 1811 21,145 Middle Peak - 16° 381 2611 67° 491 1711 21,094 North Peak- 16° 371 50" 67° 491 3911 21,060 The heights (with the exception of the unimportant difference of a few feet in the South Peak of Tilimani) are the same as those given in the map of the Lake of Titicaca. A sketch of the last-named mountain (Tilimani), as it shows itself in all its majesty from La Paz, has been given by Mr. Pentland in the Journal of the Royal Geographical Society, vol. v. (1835), p. 77. This was five years after the publication of the first measurements in the Annuaire du Bureau des Longitudes for 1830, p. 323, which results I myself hastened to make known in Germany. (Hertha, Zeitschrift ftir Erd und Volkerkunde, von Berghaus, bd. xiii. 1829, s. 3-29.) The N evado de Sorata is to the east of the village Sorata, or Esquibel : it is called in the Ymarra language, according to Pentland, Ancomani, Itampu, and Tilhampu. We recognise in "Tilimani," the Ymarra word" illi," snow. If, however, in the easte1·n chain of Bolivia the Sorata was long assumed 3718 French, or 3952 English feet, and the Tilimani 2675 19 |