Bui. 544, U. S. Dept. of Agriculture. 
Plate II. 
Fiq. 1.— In the Virgin Forest. 
Fig. 2.— In an Opening Made by a Cutting 12 Years Previous. 
Fiq. 3.— Under a Stand of White Birch and Popple on a Burn of 40 Years Ago. 
SPRUCE REPRODUCTION. 
