5r 56° SS" _ 54° 53' 52° 51° 50° 48° 48° 47° 46° 45° 44° 43° 



58° 57° 56° 55° 54° 53° 52° 51° 



FiouHE 27.— Third otulsc, March 6 to 24, 1937. showing surface isotherms, track of ' 



50° 49° 48° 47° 46° 45° 



and ice conditions. Figures indicate date that ice was sighted or reported. 



81041—39 (Face p. 42) No. 



