^ 



I 



H 





to. 



'<th 



^ 





ed; 



•in 



in 



a 



neare, 

 bat t^ 



ition of 

 i moua- 

 tlie line 

 ■reel erlj 



Ued the 



)r ae 

 lifornia 



in the 

 er, lat. 



1 



Oil 



Bnch 

 ted Tritli 



ew 



Gra 



-bain 



t 



of 



idian- or 



1 



sa 



boost 



dcano of 

 r )lada- 



e l seri e5 ' 

 iieli ^ 

 the ^ 







Ch. XXIIL] 



OF VOLCANIC EEGIONS. 



585 



low. In the former or volcanic series, are Granada, St. Vin- 

 cent, St. Lucia, Martinique, Dominica, Guadaloupe, Mont- 



Nevis 



In the calcareous chain are 



Tobago, Barbadoes, Mariegallante, Grandeterre, Desirade, 



Martin 



The 



most considerable eruptions in modern times have been 

 those of St. Vincent. Great earthquakes have agitated St. 

 Domingo, as will be seen in the thirtieth chapter. 



I have before mentioned (p. 456) the violent earthquake 

 which in 1812 convulsed the valley of the Mississippi at New 

 Madrid, for the space of 300 miles in length, of which more 

 will be said in the twenty-eighth chapter. This happened 

 exactly at the same time as the great earthquake of Carac- 

 cas, so that it is possible that these two points are parts of 



The island of Jamaica, 

 with a tract of the contiguous sea, has often experienced 

 tremendous shocks ; and these are frequent along a line 

 extending from Jamaica to St. Domingo and Porto Rico. 



Thus it will be seen that, without taking account of the 

 West Indian and Mexican branches, a linear train of vol- 

 canos and tracts shaken by earthquakes may be traced from 

 the island of Chiloe and opposite coast to Mexico, or even 



La River — a distance upon 

 ole to the equator. In 



one subterranean volcanic region. 



perhaps to the mouth of the C 

 the whole as great as from 

 regard to the western limits 



must 



to us. On the east they are not prolonged to a great dis- 



West 



seem 



Mount 



States of North Ame- 

 In California, Oregon, 



men 



tioned. 



Volcanic region from the Aleutian Isles to the Moluccas and 

 Isles of Sunda. — On a scale, which equals, or surpasses, that 

 of the Andes, is another line of volcanic action, which com- 

 mences, on the north, with the Aleutian Isles in Russian 

 America, and extends, first in a westerly direction for nearly 

 200 geographical miles, and then southwards, with few in- 



