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of the main glaciers to which they were formerly tributary. 

 One by one the tidal glaciers have been severed by recession, 

 a continuation of which has forced their fronts back toward 

 the inlet heads. From the ends of the non-tidal ice tongues 

 innumerable streams flow down over the land; and from 

 the tidal glacier fronts icebergs are discharged into the sea, 



Excursion C 8. 



Muir glacier in 191 1 . 



littering the fiord waters with floating ice, which in places 

 seriously interferes with navigation, even with small boats. 

 This is especially true toward the head of the northwestern 

 arm of the bay, but floating ice is found throughout the 

 inlet, and some even escapes from the bay into Icy strait. 

 Although the topographic conditions in the mountains 

 back from Glacier bay are known only in general, it is 

 possible to divide the glaciers into three groups. The first 

 of these ncludes the Muir glacier and the Carroll and 

 Rendu glaciers to the west; the second, fed mainly from 

 the Fairweather range, includes the Grand Pacific, John 

 Hopkins, Lamplugh, and Reid glac'ers; and the third, fed 

 from the mountains between Brady glacier and Glacier bay, 



