3J2 EEACTION OF THE INTERIOR OF THE EARTH 



remark in the small phenomenon of veins of ore the same 

 kind of agreement as in the great one of lines of moun- 

 tains, or of islands, extending over entire continents or 

 extensive regions of the globe. Secondary veins having 

 the same "strike" as the principal one, and accompany- 

 ing or secondary chains of mountains (" chaines accom- 

 pagnantes"), are often found at considerable distances; 

 they point to the same causes and to the same directions 

 of the form-giving agency in the folding or wrinkling of 

 the earth's crust. The conflict of forces in the simulta- 

 neous opening of fissures in opposite directions appears 

 to produce now and then extraordinary juxtapositions of 

 form ; as in the complicated outlines of Celebes and 

 Gilolo. 



Having thus indicated the inherent geological con- 

 nection of the eastern and southern Asiatic islands, we 

 will in order not to depart from the old, somewhat 

 arbitrary, geographical divisions and nomenclature, take 

 the southern limit of the East-Asiatic chain of islands 

 at the point where near Formosa the direction turns or 

 passes, as already stated, from N.E. S.W. to N. S., 

 in the 24th degree of north latitude. The enumeration 

 is again made from north to south ; beginning with the 

 easternmost, rather American than Asiatic, Aleutian 

 Islands. 



The Aleutian islands, rich in volcanoes, comprise, 

 proceeding from east to west ; the Fox islands, among 

 which are the largest of the entire series Unimak, Una- 

 laschka,and Umnak; the Andrejanowski islands, amongst 

 which the most celebrated are Atcha with three smok- 

 ing volcanoes, and the island of the great volcano 

 of Tanaga, which has been drawn by Sauer; the Rat 



