PLATE 5

Fig. 2. Islands in Lake Atlin opposite the town. These islands are clothed
with balsam fir, which does not grow on the adjacent mainland at this level.
They are much more densely populated with small land birds than is the main-
land, and several species of water birds nest there also. Photo taken September 6,
1924,

Fig. 3. ‘‘Blue Cajion,’’ at about 4000 feet elevation on upper Spruce Creek;
a scene of former mining activities. The valley and lower mountain slopes
here shown are typical of the habitat of the willow ptarmigan in this region.
The rock and white-tailed ptarmigans inhabit the higher ridges. Photo taken
September 1, 1924. :