THE COLD WALL. 



March 27, 1922, 41 ° 40' N., 51 ° 07' W., looking westward. This is a rare photograph show- 

 ing the meeting of the Arctic Drift and the Gulf Stream. The surface of the water on the 

 cold side of the "Wall" was smooth and glassy, its temperature being 34°, while on the 

 south side the surface was chopped and rippled, the sea temperature being 66° — a range 

 of 22° in the length of a step. 



