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THE POPULAR SCIENCE MONTHLY 



Balcony Hodse, North End, Mesa Verde National Park. 



ness that have come before them. But there has been neither time nor 

 energy for planning a series of publications such as have been outlined 

 and it has been extremely difficult to make the limited beginning de- 

 scribed above. The essential things have been done, but many desir- 

 able things have perforce been left undone. 



Photograph by Arthur Chapman. 

 Spruce Tree House, Cliff Dwellings, Mesa Verde National Park, Colo. 



