196 ROYAL SOCIETY OF CANADA 



hollow which it makes in the water; while the presence of the ice gives 

 the wind a better hold than it would have upon the surface of open water, 

 free from ice. 



There is one condition of the ice which may prevent it from sliow- 

 ing correctly the drift of the water. When it is set against an island or 

 headland and packed together for a long distance out, with open water 

 beyond, it may circle round as on a pivot. The outer edge of the pack 

 may thus make a long sweep very different in its path from the tnie set 

 of the current; and its movements also become irregular, as vessels 

 caught in such ice which are near together in the evening, may be ten 

 or fifteen miles apart in the morning. 



