^- BERCS 



O -CROWUERS. 



l^^-FIELO ice. 



APRIL I- n, 1^2^. 



ICE PATROL 



GRAND BANKS 



ISOTHERMS BASED ON lOgg 

 TEMPERATURE REPORTS. 



i luUKE .;.-iarfLce teuii.tralurei A|,i.l l-;«. i92S. l-orlious of steamship tracks in use and souii-ernmost K-e are sliown. Uoucd lines conDecting berg pos-t.ons indic-ate probable drift tracii. 



100277—30. (Face p. 134.) No, 1 



