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E Rockies of Colorado cross the State from 

 north to south in two ranges that are 

 roughly parallel and from thirty to one hundred 

 miles apart. There are a number of secondary 

 ranges in the State that are just as marked, as 

 high, and as interesting as the main ranges, and 

 that are in every way comparable with them ex- 

 cept in area. The bases of most of these ranges 

 are from ten to sixty miles across. The lowlands 

 from which these mountains rise are from five to 

 six thousand feet above sea-level, and the moun- 

 tain-summits are from eleven thousand to thirteen 

 thousand feet above the tides. In the entire moun- 

 tain area of the State there are more than fifty 

 peaks that are upward of fourteen thousand feet 

 in height. Some of these mountains are rounded, 

 undulating, or table-topped, but for the most part 

 the higher slopes and culminating summits are 



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