HYPSOMETRIC 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 of position, which he 

 communicated to me in a letter from Paris (October 1848), 

 subsequent to the publication of his great map. 



Nevado of Sorata, or 



Ancohuma. 



South Peak 



North Peak 



Illimani. 

 South Peak 

 Middle Peak . . 

 North Peak 



The numbers representing the heights are, with the excep- 

 tion of the unimportant difference of a few feet in the South 

 Peak of Illimani, the same as those in the map of the Lake of 

 Titicaca. A sketch of the Illimani, as it appears in all its 

 majesty from La Paz, was given at an earlier date by Mr. 

 Pentland in the Journal of the Royal Geographical Society.^ 

 But this was five years after the publication of the first mea- 

 surements in the Annuaire du Bureau des Longitudes for 1830, 

 p. 323, which results I myself hastened to disseminate in 

 Germany. f The Nevado de Sorata lies to the east of the 

 village of Sorata or Esquibel, and is called in the Ymarra lan- 

 guage, according to Pentland, Ancomani, Itampu, and 111- 

 hampu. In Illimani we recognize the Ymarra word illi, snow. 



If, however, in the eastern chain of Bolivia the Sorata was 

 long assumed to be 3962 feet, and the Illimani 2851 feet 

 too high, there are in the western chain of Bolivia, according 

 to Pentland's map of Titicaca (1848), four peaks east of Arica 

 between the latitudes 18° 7' and 18° 25', all of which exceed 

 Chimborazo in height, which itself is 21,422 feet. 



These four peaks arc : — 



English feet. French feet. 



Pomarape . . 21,700 . . 20,360 



Gualateiri . . 21,960 . . 20,604 



Parinacota . . 22,030 . . 20,670 



Sahama . . . 22,350 . . 20,971 



* Vol. v. (1835), p. 77. 



+ Hertha, Zeitschrift fiir Erd unci Vdlherhunde, von Berghaus, hd. 

 xiii. 1829, s. 3-29. 



