102 



POPULAR SCIENCE MONTHLY 



Fig. 3. Hanging Valley in Grenville Channel, Inside Passage. Waterfall of stream 

 draining the broad, U-shaped valley seen near water in right-hand half of picture. Photo- 

 graph by Lawrence Martin. 



feature a view up or down such a valley is not usually very extensive, 

 being cut off by the projecting spurs around which the stream swings. 

 The absence of this feature in those Alaskan valleys where there is a 



Fig. 4 Waterfall on the Very Face of the Rock Lip of a Hanging Valley behind 

 Sara Island, Inside Passage. Photograph by Lawrence Martin. 



