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H. O. Pub. No. — Sailing Directions for — 



75. East Greenland and Iceland. 



76. Baffin Bay and Davis Strait. 



77. Northern Canada. 



136. Northwest and North Coasts of Norway. 

 138. Antarctica. 



H. O. Pub. No. 550, Ice Atlas of the Northern Hemisphere, should 

 also be consulted for detailed information on monthly ice conditions 

 in the Arctic. 



Most recent expeditions which have spent only late spring, summer, 

 and early fall months in the polar regions have reported some surprise 

 at the relatively mild temperatures encountered. Long summer day- 

 light and the heat-buffering properties of sea water combine to pro- 

 duce conditions far better than those experienced by the mariner oper- 

 ating out of Boston, Mass., or Portland, JSlaine, in winter. 



A. HOBBS, 



Captain, U. S. Navy, {Ret.) 



Hydrographer. 



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