THE GEOGRAPHIC SOCIETY'S ALASKAN EXPEDITION 39 



THE ADVANCING MARGIN OF ATREVIDA GLACIER BROKEN BY RECENT 



FORWARD MOTION 



In 1905 this was a moderately sloping, moraine-covered ice margin; in 1906 it was a 

 jagged cliff from which blocks of ice and stones were constantly falling into the forest, which 

 was being overwhelmed (see pages 17 and 29). 



selected points, which can again be occu- 

 pied, are of high importance. The ex- 

 pedition was fortunate in having the serv- 

 ices of Mr O. D. von Engehi, a skilled 

 photographer trained also in physiog- 

 raphy, to the results of whose work we 

 .are much indebted ; and his photographs 

 taken during this expedition as well as 

 those which he took on the expedition of 

 1906 will be of great value in all future 

 work on these glaciers. To these three 

 ■men the authors are especially indebted 

 for careful, conscientious work in their 

 iields, as well as for generous assistance 



whenever and wherever needed. All 

 future students in these fields will profit 

 from their excellent work. 



The glaciers of the Alaskan coast are 

 especially interesting to the student of 

 continental glaciation because here large 

 masses of ice descend into a cool, damp, 

 temperate climate, much as was the case 

 at the base of the Alps and other moun- 

 tains during the Glacial period. The 

 wasting margins of these glaciers furnish 

 much information of value in the study 

 and interpretation of the phenomena of 

 continental glaciation in Europe and 



