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T. C. CHAMBERLIN 



of about two miles. It is the master glacier of the vicinity 

 both in respect to dimensions and activity. 



The descent of its floor is apparently between 2000 and 3000 

 feet. This is accomplished by a somewhat steep fall from the 



Fig. 64. Transverse view of Bowdoin glacier seen from the heights on the east 

 looking northwesterly. The glacial movement is from right to left. The dark longi- 

 tudinal line represents the sunken medial moraine. The undulations of the surface 

 are fairly well indicated. The slope just beyond the crevassed area in the right fore- 

 ground and between that area and the medial moraine inclines backward, i. e., to the 

 right, and a brook flows in that direction. The notable feature of the surface is the 

 crevassing. The nunatak beyond the Bowdoin glacier on the right is the Sierra, that 

 on the left the Sentinel. The Tuktoo glacier is seen between these and in the dis- 

 tance a glimpse of the Sun glacier is obtained. The ice-capped heights beyond are 

 a part of the border of Prudhoe Land. Lieutenant Peary's first route across the ice- 

 cap lay along these heights. Photograph by Professor Wm. Libbey, Jr. 



upland to the valley, and then by a notable but unequal decline 

 throughout its remaining course. The inequality of the decline 

 is indicated not only by the undulation of its profile, but by 

 intensive crevassing which distinguishes it from most of the val- 

 ley glaciers of the vicinity. The crevassed condition is well 

 shown in Fig. 64 and is worthy of thoughtful consideration 

 when the relatively slight undulations and the relatively slow 

 movement of the glacier are taken into consideration. Such pro- 



