THEIR GEOLOGICAL INFLUENCES. 
459 
which are disposed about a convexity of uniform curv- 
ature. 
We are to remember besides, in considering the ge- 
ological eccentricities which are to he referred to the 
action of icebergs, the immense quantities of foreign 
material which I have spoken of as discoloring or stain- 
ing so many of the bergs of Omenak, Ovinde, and 
Melville Bay. These ice-masses are of many millions 
of tons, all of them bearing the elements of gneissoid 
rocks, to be deposited in distant localities. A refer- 
ence to my current chart will show that they pass, in 
the first instance, toward the north, and, descending 
along the western coast, perform the entire circuit of 
the bay. The extensive reaches of shoals, which are 
so marked a feature of this coast from Pond Bay to 
Cape Kater, may be due to this character of berg-drift. 
The islands and shallows about the mouth of Jones’s 
Sound must, I suppose, be referred to it also. 
BOWLDERS IN ICEBERG. 
