148 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
some alfalfa fields: the alfalfa serves for local needs; the fruit is sold to 
neighboring ranches and villages. Another valley supplies water for 
some alfalfa fields belonging to the ranch at Cane spring. This spring 
itself seems to rise where the long wash slope from the mountains on the 
north comes against the rock that descends from the spurs on the south. 
Every drop of water available in the growing season is used. Storage 
reservoirs in the mountains would increase the summer supply, but such 
reservoirs would be so soon filled with waste — should they indeed escape 
destruction by a cloud-burst torrent — that the cost of their construction 
would, it is to be feared, never be repaid. 
The Mountain Face. —The study of mountain morphology is so little 
advanced that one encounters difficulty both as to method and terms in 
Ficure 6. 
Diagram showing notches in the front of a young tilted block; some of the front edge of 
the block still remains. 
atterapting to present a definite account of mountain forms. It is evident, 
however, that the face of a range, carved on the fault scarp of its tilted 
or lifted block, should present certain features characteristic of such an 
origin, and that these features should be deduced as carefully as any 
others in the mental construction of the type example, so that their oc- 
currence or absence in actual ranges may be determined. In no other 
way can it be ascertained whether the face of the range as well as its 
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