khed, it ib somewhat remarkah] 

 V on these have been com' 

 ■ their broad general outlines" 

 ^»d submarine elevations have 

 ^■nt years, and in some region 

 Rsent a much more complicated 



^Bieres have been kept up to 



Hay and Mr. J. G. Bartholomew 



reduced chart given here will 



Ire deep soundings are most 



ph yet recorded in the ocean is 

 \ metres), or 66 feet less than 

 ETCus was a sounding taken by 

 in the Challenger Deep to the 

 jpnes, where the " Challenger " 

 ■4,575 fathoms. Depths greater 

 are also known in the Aldrich 

 Hie There are altogether ten 

 Ixceeding 4,000 fathoms have 

 Ihese being in the Atlantic, and 

 (Pacific. The term " deep " is 

 ■e the ocean in which soundings 

 deeper have been taken. On the 

 h-hemisfMSfes above referred to, fifty-seven deeps 

 low shown — thirty-two in the Pacific, eighteen in 

 Vtlantic, five in the Indian Ocean, and two in the 

 hern Ocean south of latitude 40° S. 



CHART VI.— DEPTHS. (After Murray.) 



fathoms are dotted; be5'ond these a contour line is drawn at every thousand fathoms, the 6gure I meaning "over 1,000 fathoms," 

 ■ 2,000 fathoms," and so on. The extreme North is left blank (except in the Greenland area) for want of detailed observation. 



