5B° 57° 56° 55° 54° 53° 52° 51° ^0° 49^ 48^ 47° 



FiauRK IS.-Surfaoe water temperatures for March 20-26, 1933. Isotherms are drawn for each 4» F. 



46° 45° 44° 43° 



20338—34. (Face p. 34.) No. 2 



