XCvi X^/^o y J NOTES. 



stream of lava which issued from Nindiri in 1775, and which has recently been 

 seen again by a very scientific traveller, Dr. Oersted. 



( 39S ) p. 268. See all the bases on which these determinations of position in 

 Mexico are founded, and their comparison with the observations of Don Joaquin 

 Ferrer, in my Recueil d'Observ. Astron. vol. ii. p. 521, 529, and 536 550, and 

 Essai Pol. sur la Nouv. Espagne, t. i. p. 5559 and 176, t. ii. p. 173. Re- 

 specting the position of the Volcano of Colima I had myself early expressed 

 doubt (Essai Pol. t. i. p. 68, and t. ii. p. 180). By altitudes taken by Cap- 

 tain Basil Hall under sail, that volcano would be in N. lat. 19 36', or half a 

 degree north of the position which I had inferred from the Itineraries ; but 

 without absolute determinations for Selagua and Petatlan, which I used as 

 points of departure. The latitude and the elevation (12,003 English feet), given 

 iu the text, are taken from Admiral Beechey (Voyage, Pt. II. p. 587). The 

 most recent map by Laurie (the Mexican and Central States of America) gives 

 19 20' for the latitude. The latitude of Jorullo may also be two ( or three 

 minutes wrong, as when there I was much engaged with geological and topo- 

 graphical examinations, and neither sun nor stars were visible for the determina- 

 tion of latitude. Compare Basil Hall, Journal written on the coast of Chili, Peru, 

 and Mexico, 1824, vol. ii. p. 579 ; Beechey, Voyage, Pt. II. p. 587; and Hum- 

 boldt, Essai Pol. t. i. p. 68, t. ii. p. 180. In the faithful and highly picturesque 

 views which Moritz Rugendas has taken of the Volcano of Colima, and which are 

 preserved in the Berlin Museum, one may distinguish two mountains near each 

 other, one the proper volcano from which smoke always issues, which has but 

 little snow, and the other, the loftier Nevada, which enters deep into the region 

 of perpetual snow. 



C 394 ) P* 272. The following is the result of the determinations of latitude 

 and longitude of the five linear groups of volcanoes in the Andes, and also a state- 

 ment of the distances between the groups, elucidating the relative amount of the 

 volcanic and non volcanic spaces : 



I. Group of Mexican volcanoes. The fissure on which they rise runs 

 east and west from Orizaba to Colima, for a distance of 392 geographical 

 miles, between 19 and 19 20' N. lat. The Volcano of Turtla stands 

 apart, 128 miles to the east of Orizaba, near the coast of the Gulf of 

 Mexico, in a parallel (18 28') half a degree more to the south. 



II. Distance of the Mexican from the next, the Central American group 

 (being the distance from the Volcano of Orizaba to that of Soconusco in the 

 E.S.E. W.N.W. direction) : 300 miles. 



III. Group of Central American volcanoes: its length from S.E. to N.W., 

 from Soconusco to Turrialva in Costa Rica, above 680 miles. 





