! CHAP, viz.] DEEP-SEA TEMPERATURES. 321 



A series of temperature soundings, at depths in 

 creasing progressively by 250 fathoms, Avas taken to a 

 depth of 2,090 fathoms, on the 24th of July, lat. 

 47 39' K, long. 11 33' W. 



Surface . . 17'08C. 



250 fathoms . 10 28 less than Surface . . 7' 5 C. 



500 8 8 250 fathoms . 1-5 



750 . 5 - 17 500 . 3 G 



1,000 . 3 5 750 .1-7 



1,250 . 3 17 1,000 .0-3 



1,500 2 9 1,250 . 3 



1,750 . 2 Gl 1,500 .0-3 



2,090 2 4 1,750 .0-2 



The same two Miller-Casella thermometers were 

 employed as in the previous observation. 



Another serial sounding was taken a few days late^ 

 in water 862 fathoms deep, somewhat nearer the coast 

 of Ireland. In this case the temperature was taken 

 at intervals of 10 fathoms from the surface to a 

 depth of 50 fathoms, and thence at intervals of 

 50 fathoms to the bottom. This was done to deter 

 mine exactly the rate of diminution of temperature, 

 and the exact position of the most marked irregu 

 larities. 



Surface . . 17-22C. 



10 fathoms. 16 72 less than surface . . . 0- 5 C. 



20 . 15-22 less than 10 fathoms . 1 ' 5 



30 . 13 33 20 .1-9 



40 . 12-44 30 .0-9 



50 .11-8 40 0-6i 



100 . 10 6 50 .1'2 



150 . 10 5 100 0-1 



200 . 10 3 150 . 0-2 



250 . 10. 11 200 



300 9 8 2:><> 



