us 



W. T. BRIGHAM ON THE VOLCANIC PHENOMENA 



Tuxtla on the Gulf of Campeachy, and extending to the Eevillagegido Islands some two 

 hundred miles west of the Pacific coast, exhibits this transverse direction most remarkably. 

 Now if this line be extended westward forty degrees it passes through the Hawaiian Islands 

 where the craters also range north and south. 



Commencing with the Andean volcanic line, and placing the larger end of each oval 

 crater first, as indicating the larger part of the subjacent fissure, we have the following 

 result : — 



Volcanoes. 



Volcanic Line. 



Major axis of the Ceatee. 



Deception Island 

 t Antuco 

 t Aconcagua . 

 t Sangay 

 t Siuchulagua 



Antisana 



Pichincha . 



Cayambi 



t Mombacho 

 t Masaya 

 t Coseguina 

 f Isalco 

 Agua 

 t Fuego 



Andean line S. — N. 



Tuxtla 

 t Citlaltepetl or Orizaba 

 t Popocatepetl 



Istaccihuatl 



Toluca 



Jorullo 

 t Colima 



Central American line N. 55° W. 



Mexican line E.— W. 



E.-W. 

 E.— W. 

 E.-W. 

 E.-W. 

 E.-W. 

 E.-W. 

 E.-W. 



E.— W. 



N. E.-S. W. 

 N. E.-S. W. 

 N. E.-S. W. 

 N. E.-S. W. 

 N. E.-S. W. 

 N. E.-S. W. 



S.-N. 

 S.-N. 

 S.-N. 

 S.-N. 

 S.-N. 

 S.-N. 

 S.-N. 



t Kilauea .... 

 f Mokuaweoweo 



Hualalai (several craters) 



Haleakala 



Eeka (several craters) 



Leahi 



Puawaiua 



Aliapaakai 



Kauai (ancient crater) 



t Shasta 



San Francisco 

 t Mt. Hood 



t Klutschewskaja Sopka 



t Tolbatscli 



t Awatschka 



t Wiliutschinskaja Sopka 



t Opalinskaja Sopka 



Hawaiian line E.— W. ..... S. — N. 



" S.-N. 



" S.-N. 



" " S.-N. 



" " " S.— N. 



" S.-N. 



" S.-N. 



" " S.-N. 



" S.-N. 



North American line S.— N. 



Kamtschatkan line N. 25° E. 



t Active volcanoes. 



