58° 57° 56° 55° 54° 53° 52° 51° 50° 49° 48° 47° 46° 45' 



57° 56° 55° 54° 53° 52° 51' 50° 49° 



Figure 5.— Ice conditions, April 1937. Figures Inlicate day of month ice was sighted ( 



47° 46° 45° 44° 43° 



81041—39 (Face p. 12) No. 4 



