THE VARIATIONS OF GLACIERS 87 



tributaries, which becomes an independent tide-water glacier. 

 Reid Glacier seems to have receded about f mile. 



In 1892 Hugh Miller Glacier attained tide-level at two termini; 

 one, on the north, barely reached the water and had a sloping 

 surface; this has retreated about half a mile. The other terminus, 

 on the east, was divided by a rocky mass, north of which the ice re- 

 sembled the northern terminus but south of which it ended in a cliff 

 discharging bergs. The northern part of this terminus has receded 

 about one mile and has uncovered much rock, about if square 

 miles; the southern part has receded about i| miles and the inlet 

 has increased by about 2 square miles. Charpentier Glacier has 

 receded about i| miles and its inlet has increased by one square 

 mile. Geikie Glacier has receded about f mile and Wood Glacier 

 has greatly diminished in size, though it still seems to reach tide- 

 water as in 1892 without an ice cliff. The total increase in the 

 area of Glacier Bay, as the result of the recession of the glaciers, 

 amounts to about 50 square miles. 



Professor Ralph S. Tarr has published a detailed account of 

 the Yakutat Bay Glaciers, with many illustrations and maps, 

 which includes all information regarding these glaciers available 

 at the end of 1906. 1 The remarkable advance of some of these 

 glaciers in the interval between Professor Tarr's visits to them in 

 1905 and 1906 are carefully considered and ascribed to extraordi- 

 nary supplies of snow shaken down from the mountains by earth- 

 quakes in 1899. 2 This very excellent monograph can receive only 

 a cursory notice here. Professors Tarr and Lawrence Martin 

 organized an expedition under the auspices of the National Geo- 

 graphic Society to revisit Yakutat Bay and Prince William Sound 

 in 1909. Professor Martin has sent me the following outlines of 

 the results of this expedition: 



The National Geographic Society's Alaskan Expedition of 1909 in charge 

 of R. S. Tarr and Lawrence Martin observed the following variations of 

 glaciers. 



In Yakutat Bay Hubbard Glacier seemed to be beginning to advance more 



1 "The Yakutat Bay Region, Alaska," U.S. Geological Survey, Professional 

 Paper No. 64, Washington, 1909. 



2 Mentioned in an earlier report of this series (this Journal [1908], XVI, 54-55). 



