Sledge Journey in Winter. 179 
makes it very difficult to decide whether the land 
really is an island or joined to the mainland as a 
peninsula. 
The discovery of Duke of York Island throws a 
new light on the theory which, because of its un- 
certainty in my opinion, caused Sir James Clark 
Ross to name his discovered island Doubtful Island. 
Duke of York Island is cut through from east to 
west by broad deep quartz reefs. May it here 
suffice to say that minerals of value occur in this 
vicinity, and that undoubtedly, in time to come, 
science to a great extent will receive that support 
ON THE COAST OF DUKE OF YORK ISLAND. 
from commerce which the progress of civilization 
justifies, and that future Antarctic exploration never 
will be in want of financial support. 
N 2 
