CHAP. vIn] DEEP-SEA TEMPERATURES. 39] 
A series of temperature soundings, at depths m- 
creasing progressively by 250 fathoms, was taken to a 
depth of 2,090 fathoms, on the 24th of July, lat. 
A 39 N., lone. 11° 33’ W. 
Surface . . 17°: 08C. 
250 fathoms. 10° 28 less than Surface . . 7°: 5C. 
500 &; 738 53 250 fathoms. 1° 5 
(3) aeer VON rg 5 500, 3)-.6 
L000 ,; 3° 5 , 750R t. tO 
1250) —., 3-17 - 1,000). 0:3 
1,500 ,, 2+9 2 eneee 0-3 
G50. 25 P61 sf 1500) 3) OLS 
7 UE) ee 2°4 - bE) ok 0-2 
The same two Miller-Casella thermometers were 
employed as in the previous observation. 
Another serial sounding was taken a few days later 
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 tempera- 
ture, and the exact position of the most marked 
irregularities. 
Suniace, = .. 17-2 22.C. 
1Ofathoms., 16° 72 less than surface . Uae &- 
74 a Hoel 22 less than 10 fathoms. 1° 5 
2; Uae ye linseOer is: r 2005 2. cele 
OE 2 AD ad a 30> 3 = 0,59 
Sve. eee) Mea cri oes e cy) ees 
LOODs es. EO. 6 ; Ose ae de 
50) git. ees Lome ., 0-1 
200! = me hOR 3 3 150 =  LOGsS 
DO eo etl a 2007 age (ea 
300" ~ 5; a Ee eS . 250, .) ORNS 
