CHAP, iv.] THE CRUISES OF THE 'PORCUPINE.' 153 



a bottom temperature of 5- 2 0. We were thus in 

 the warm area, and the dead-cold water of the cold 

 area lying fifty or sixty miles off, with the bottom 

 at a higher level, was completely banked in. The 

 bottom temperature here corresponded so closely 

 with that of the same depth in the Rockall Channel 

 that apparently scarcely a drop of the Arctic in- 



rio. 20. Zoroaster fulgens, WrviLLJS THOMSON. One-third the natural size. (No. 78.) 



draught makes its escape in this direction. The 

 dredge here brought up half a ton of Atlantic 

 'globigerina ooze,' a load which tested its tackle 

 and the donkey-engine to the utmost. The weight 

 of the dredge "itself with the weight attached was 

 8 cwt., so that altogether the burden reached not 



