ILLUSTRATIONS. 



Page. 

 Figure 1. Growth in diameter in relation to age of western yellow pine, 



Douglas fir, and blue spruce 12 



2. Relation of height growth to age of western yellow pine, Douglas 



fir, and blue spruce 14 



3. Growth in volume of western yellow pine, Douglas fir, and blue 



spruce 16 



4. Increment growth of western yellow pine, Douglas fir, and blue 



spruce 20 



4 



