Natural Sciences of Philadelphia 21 
inunity, as the abundant water supply of the Gunnison River is 
carried through a six mile tunnel under a mountain range, and 
helps the otherwise inadequate water supply of the Uncompahgre 
River irrigate the fertile and extensive Uncompahgre Valley. To 
the south of Montrose, and hemming in the valley in that direc- 
tion, one sees the jagged outlines of the San Juan Range, as saw- 
toothed as any range of great size in the United States, of far greater 
charm and variety than the main chain of the Rockies generally 
seen by the tourist. To see the San Juans one must go off of the 
Looking North-east from St. Sophia Ridge, San Juan Mountains, 
ABOVE TELLURIDE, COLORADO. ELEVATION, 13,100 FEET. 
main arteries of travel ; there is no doubt in our mind but they will 
feel repaid for the experience. For our San Juan work the mining 
town of Telluride was our center. Here at 8800 feet the nights are 
cold, even in early September, as you are virtually at the head of the 
box canyon of the San Miguel River, the smelter-polluted water of 
which rolls its gray course over a cobbly bed. In every direction but 
to the west Telluride is encircled by high mountains, and our work 
carried us from the vicinity of the town to the summit of St. Sophia 
Ridge at 13 100 feet. Several great and famous gold mines were on 
our route, the “Smuggler” and “Tom-Boy” particularly, while the 
“Liberty Bell” was nearby. Above the “Tom-Boy” mine, at 
1 1500 feet, we passed the last of the timber and from there upward 
