CHAP. VII.] 



DEEP-SEA TEMPERATURES. 



321 



A series of temperature - soundings, at depths in- 

 creasing progressively by 250 fathoms, was taken to a 

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

 47° 39' N., long. 11° 33' W. 



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. 



