HYPSOMETRIC ADDENDA. 



I AM indebted to Mr. Pentland (whose scientific labors 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 : 



The heights (with the exception of the unimportant difference of 

 a few feet in the South Peak of Illimam) are the same as those given 

 in the map of the Lake of Titicaca. A sketch of the last-named 

 mountain (Illimani), 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 fur 

 Erd und Vblkerkunde, 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, Anco- 

 mani, Itampu, and Illhampu. We recognize 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 

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