58° 57° 56° 55° 54° 53° 52° 51* 50° 49° 48° 47° 46° 45° 44° 43° 



FiooEE 21.— Third cruise, April 20 to May 4, 1936, showing surface isotherms, Ice conrtilions, and traclc of vessel. Numbers indicate day on which Ice was sighted or reported. 



149346—38 (Face p. 24) No. 5 



