Proc. Am. Philos. Soc, Vol. XLVI., No. 187. 



Coast Survey M..p of the North P..r,P,c Ocean, showing the deep trenches in the sea bottom dug out by Earthquakes in uphfting the Aleutian Kurile and Taoanese Island. In 

 the contour l.nes 4 po.nts denote a depth of 4000 fathoms, 3 points 3000 fathoms, the continuous dashe .000 fathoms and the continuousline near shor'e ^^ fitloms. ' 



