iv POLAR PROBLEMS 



Sir Douglas Mawson Unsolved Problems of Antarctic 



Exploration and Research . . 253 



Erich von Drygalski The Oceano graphical Problems of 



the Antarctic 269 



Griffith Taylor Climatic Relations between Ant- 



arctica and Australia .... 285 



Jules Rough The Meteorology of the American 



Quadrant of the Antarctic . . 301 



R. E. Priestley and 



C. E. TiLLEY Geological Problems of Antarctica 315 



R. E. Priestley and 



C.S.Wright Some Ice Problems of Antarctica 331 



R. N. RuDMOSE Brown Antarctic and Sub-Antarctic Plant 



Life and Some of Its Problems 343 



Robert Cushman Murphy Antarctic Zoogeography and Some 



of Its Problems 355 



Richard E. Byrd Polar Exploration by Aircraft . 381 



George H. Wilkins Polar Exploration by Airplane . 397 



Lincoln Ellsworth Arctic Flying Experiences by Air- 

 plane and Airship 411 



Umberto Nobile The Dirigible and Polar Explora- 

 tion 419 



Robert A. Bartlett Ice Navigation 427 



O. M. Miller Air Navigation Methods in the 



Polar Regions 445 



Conversion Graphs 458 



Index 459 



A brief biographical notice of each contributor appears on the 

 page facing the beginning of his paper. 



Separate Illustration 



Bathymetric Map of the Arctic Basin, by Fridtjof Nansen, 

 revised to 1927. Scale, 1:20,000,000 facing p. 14 



