Nevado of Sorata, or Long. from Height in Ancohuma. S. lat. Greenwich. English Feet. South Peak 15° 51′ 33″ 68° 33′ 55″ 21286 North Peak 15° 49′ 18″ 68° 33′ 52″ 21043 Illimani. South Peak 16° 38′ 52″ 67° 49′ 18″ 21145 Middle Peak 16° 38′ 26″ 67° 49′ 17″ 21094 North Peak 16° 37′ 50″ 67° 49′ 39″ 21060 The heights (with the exception of the unimportant difference of a few feet in the South Peak of Illimani) are the same as those given in the map of the Lake of Titicaca. A sketch of the last-named mountain (Illimani), as it shews 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 für Erd und Völkerkunde, von Berghaus, Bd. xiii. 1829, S. 3-29.) The Nevado 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 Illhampu. We recognise in “Illimani,” the Ymarra word “illi,” snow. If, however, in the _eastern_ chain of Bolivia the Sorata was long assumed 3718 French, or 3952 English feet, and the Illimani 2675 French, or 2851 English, feet too high, there are in the _western_ chain of the same country, according to Pentland’s map of Titicaca (1848), four peaks to the east of Arica and between lat. 18° 7′ and 18° 25′, all of which are higher than Chimborazo, which is 21422 English or 20100 French feet. These four peaks are-- Pomarape 21700 English feet, or 20360 French feet. Gualateiri 21960 „ „ 20604 „ „ Parinacota 22030 „ „ 20670 „ „ Sahama 22350 „ „ 20971 „ „