PLATE IV 



Fig. I. — The upper slopes of Mount Sischu, forming the divide between 

 Novi and Kuskokwim rivers. Scanty exposures of lichen-covered rocks 

 appear, and the ground is sparsely covered by sphagnum and grass. The flat 

 top of the summit in the distance shows plainly. June 5, 1912. 



Fig. 2. — Burned black spruce forest near the head of the north fork of the 

 Kuskokwim. The shrubs are mostly dwarf birch, .\pril 28, 1912. 



