304 



SEE— THE CAUSE OF EARTHQUAKES. 



[October 19, 



to the Aleutian and Kurile Islands, the east shore of Japan, the 

 west shore of Sumatra and Java; also near New Zealand and vari- 

 ous islands in the deepest oceans, as Guam, the Bahamas and other 

 West Indian Islands, we shall perceive that this arrangement is 

 not by chance. The South American trough always appears parallel 

 to the great mountain ranges of the Andes, and the fact that it is 



Fig. 3. 



Outline Map of South America, showing the great Ocean Trough parallel 



to the Andes. 



of about the same volume as the matter included in the Cordilleras 

 appeared to be a suspicious circumstance. The relation above cited 

 for Japan, Java, and other islands is similar, but in the case of 

 oval islands the adjacent depression may not be a trough, but rather 

 a hole of somewhat oval or elliptical figure. 



Some years ago the writer noticed these remarkable sinks while 



