THE VARIATIONS OF GLACIERS 



459 



rise of the river and was followed by a strong advance in late September and 

 early October when the level of the river fell and its undercutting power was 

 weakened. This oscillation is shown in the accompanying table. 



As this advance of Childs Glacier seriously threatened a $1,400,000 steel 

 railway bridge which in October, 1910, was only 1,575 f ee t from the north 

 margin of the glacier, the behavior of Childs Glacier during the winter of 1910- 

 11, when Copper River is low and weak, will be of much interest. The diminu- 

 tion of movement on the north bank suggests, however, that the advance 

 is practically over. The advance of Grinnell Glacier is also of interest, for 

 this ice tongue occupies a strategic position with reference to the railway, 

 which traverses its stagnant outer portion. In this portion, however, there 

 was no disturbance in 1910, the advance affecting another part of the glacier. 

 The Allen Glacier, whose stagnant outer portion is traversed for 5^ miles 

 by this railway, remained unchanged from 1909 to 1910. 



It appears, therefore, that the glaciers about Prince William 

 Sound give some indication of a general, but not very large, advance. 



Correction. — In the Report on the Glaciers of the United States 

 for 1908 (Journal of Geology, XVII, 671), the name "Matamaka 

 Glacier" should have been "Matanuska Glacier." 



The regular meeting of the International Committee on Glaciers 

 took place in Stockholm on the 20th of August, 1910, in connection 

 with the Eleventh International Geological Congress. 1 The retir- 

 ing president, Professor Edouard Bruckner, presented the report 

 of the Committee to the Congress. 



He called attention to the origin of the Committee, which was 

 first appointed by the Sixth International Geological Congress in 

 1894, and has been collecting information regarding the variations 

 of glaciers ever since; and emphasized the importance of the work 



1 "La Commission international des Glaciers au Congres geologique international, 

 Stockholm, aout, 1910." Zeitschrift filr Gletscherkunde (1911), V, pp. 161-76. 



