NOTES. XCV11 



i 



IV. Distance of the Central- American group from that of New Granada 



and Quito : 628 miles. 



V. Group of New Granada and Quito ; its length from the eruption in 

 the Paramo de Ruiz, north of the Volcan de Toltma, to the Volcano of 

 Sangay: 472 miles. The part of the chain of the Andes between the 

 Volcano of Purace' near Popayan and the southern part of the volcanic 

 mountain-knot of Pasto runs N.N.E. S.S.W. Far to the east of the volca- 

 noes of Popayan, at the sources of the Rio Fragua, there is a very isolated 

 volcano which I have entered in my general map of the mountain-knots of 

 the South-American Cordilleras from the accounts communicated to me by 

 the missionaries of Timana ; distance from tho sea-shore, above 152 miles. 



VI. Distance of the New Granada and Quito group from that of Peru and 

 Bolivia : 960 miles ; which is the greatest distance without volcanoes. 



VII. Group of Peru and Bolivia, from the Volcan de Chacani and Are- 

 quipa to the Volcano of Atacama (16 2li S. lat.) : 420 miles. 



VIII. Distance of the group of Peru and Bolivia from the Chilian volcanic 

 group: 540 miles. From the part of the desert of Atacama, at the edge of 

 which rises the Volcano of San Pedro, to far beyond Copiapo, and even to 

 the Volcano of Coquimbo (30 5' S. lat.) in the long Cordillera west of the 

 two provinces of Catamarca and Rioja, there is not a single volcanic cone. 



IX. Chilian group: from the Volcano of Coquimbo to that of San 

 Clemente, 968 miles. 



These estimations of the length of the Cordilleras, with the curvatures arising 

 from changes of direction in the axis, from the parallel of the Mexican volcanoes 

 (in 19{ N. lat.), to the Volcano of San Clemente in Chili (46 8' S. lat.), give 

 for an entire distance of 4968 miles a space of 2,540 miles occupied by five 

 linear groups of volcanoes (Mexico, Central America, New Granada and Quito, 

 Peru and Bolivia, and Chili), and a space of 2428 miles probably without vol- 

 canoes. The spaces are therefore nearly equal. I have given very definite nu- 

 merical relations, such as could be derived from a careful discussion of my own 

 and other maps and materials, in the hope of inducing others to further rectifi- 

 cation and improvement. 



(s>5) p 272. The group of Mexican volcanoes comprises those of Orizaba *, 

 Popocatepetl*, Toluca (or Cerro de San Miguel de Tutucuitlapilco), Jorullo*, 

 Colima*, and Turtla*. The still burning volcanoes are here, as in other similar 

 lists, marked by an asterisk. 



(398^ p 272. The volcanoes of the Central-American group are enumerated 

 in Notes 390 and 391. 



C 87 ) p. 272. The group of New Granada and Quito comprises the Paramo 

 VOL. IV g 



