58* 57° 56° 55° 54° 53° 52° 51° 50° 48° 48° 47° 46° 



Figure 40.— Seventh cruise, May 17 to 31, 1938, showing surface isotherms, track of Patrol vessel, and ice conditions. Figures indicate date that ice was sighted or reported. 



147469—40 (Face p. 66) No. 



