North American Fauna No. 27, U. S. Dept. Agr. Biological Survey. 



Plate XXIV. 



Fig. 1.— White Spruce Near Leith Point, Great Bear Lake. 

 [This tree, 2 feet in diameter, was estimated to be at least 1.000 years old. 



Fig. 2.— Dwarfed Trees, Mainly White Spruce, on Upper Slope of Mount 



Tha-on'-tha. 



