256 CAVE AND CUFF DWELLERS. 
unknown fastnesses of the Sierra Madres 
of Mexico. 
From the cliffs we were on, among the 
pines and cedars, we could look far down 
into the valley of the Urique with our 
field glasses and see the great pitahaya 
cactus, a product of the tropical climes. 
In between were the oaks and other prod¬ 
ucts of temperate climates, showing us 
in a huge panorama nearly all the plant 
life from the equator to the poles. We 
sat on the bold, beetling cliffs, and could, 
drink ice water from the clear mountain 
springs that threw themselves in silvery 
cascades below, and view the river far 
down in the valley, a perpendicular mile 
below us, the waters of which were so 
warm that we knew we could bathe in 
them with comfort. Away off across the 
great canon were lights, as evening fell, 
