178 
The Colorado River 
gorges of the Grand Canyon, where, for a thousand feet, they 
are black. Below the junction, forty miles, they came to the 
mouth of the San Juan! Yet Cataract Canyon and Narrow 
together, the first canyons of the Colorado proper, are fifty 
A Glen of Glen Canyon. 
These are numerous hence the name. 
miles long and the San Juan comes in at least seventy-five 
miles below their end. The walls of the San Juan he describes 
as being as high as those of the Colorado, which he has just 
been talking about, that is, five thousand feet, yet for these 
seventy-five miles he would have actually been passing be- 
