ANTARCTIC ADVENTURE AND RESEARCH 



490 miles of ice, though the average is 288 miles at 

 this season, while in 191 5 the "Aurora" only met with 

 one mile of pack. 



As experience in traveling through the pack ice has 

 accumulated, it is clear that the worst conditions occur 



N^irOCEAfi. 



Fig. 25. — Variations in width of pack ice off Queen 



Mary Land. 



Note the Shackleton Ice Shelf, possibly buttressed by glacier 

 ice. (After Mawson and Davis.) 



on coasts facing the east and the dominant winds. 

 The drifts of the three ships, the "Deutschland," "En- 

 durance," and "Aurora," show clearly that the ice 

 moves to the northwest and tends to pile up on the west 

 coast of the Ross Sea and on the west coast of the 



172 



