12 NORTH AMERICAN FAUNA. No. 16. 
Brewer Creek Canyon in the upper part of the white-bark pines. Find- 
ing absolutely no grass or other feed for the animals here, we crossed 
the canyon lower down (a little below the forks) and continued on 
over rough lava ridges in the upper edge of the forest until dark, 
when we camped on Inconstance Creek (fig. 3). The third day we pushed 
Fig. 3.—Shasta from Inconstance Creek, near tinberline on north side. 
on around the north end of the mountain, keeping a little below the 
great glaciers, and in the main near timberline. We climbed over a 
number of lava ridges, availed ourselves of a natural passageway 
(‘North Gate’) at the upper end of a pair of conspicuous lava buttes, 
traversed a curious pumice plain covered with timberline mats of 
prostrate white-bark pines (fig. 22), crossed the fearful canyons of Whit- 
ney and Bolam creeks, and finally reached Shastina, where, after a very 
severe day, we camped on some small streams of snow water on the 
north side (fig. +). The fourth morning we climbed the rough slide rock 
of Shastina to an altitude of 10,000 feet, in order to get around a high 
impassable lava ridge, and then, after encircling a great amphitheater 
of rough slide rock, descended by some immense masses of perpetual 
snow to the white-bark pines, in which we continued to the great can- 
yon on the west side of Shastina (pl. 11), which I named Diller Canyon, 
in honor of J.8. Diller of the U.S. Geological Survey, in recognition of 
his admirable researches on the geology of Shasta. After crossing 
Diller Canyon we kept in the upper part of the Shasta fir forest all the 
way to Panther Creek, which we followed down to Wagon Camp. This 
