59° 58° 



56° 55° 54° 53° 52° 51 



. .-i-.. y^^.-..-^^L _.^-^ -JgL 1^° ^^°L i ^^° ^° 43° 



59° 58° 57° 56° 55° 54° 53° 52' 



48° 47° 46° 45° 44° 43 



Kk.ike la- Kourth cruise, ice uiimil, Tampa, IS May-5 Jiiiii' 1U5I), showing suifaw isotherms. 



955984 O - 51 (Face p. 20) No. 5 



