258 PRACTICAL FORESTRY 
but prefers a deep and moist, cool and well-drained 
one; succeeds well on a dry, slaty soil and on sand 
dunes and exposed situations. Surpasses almost all 
of the conifers in the rapidity of its growth, and en- 
DouGLaAs-FIR ( Pseudotsuga taxifolia). 
dures much drought; shade-enduring. One of the 
largest and most important forest trees of the West. 
For eastern planting seed should be procured from 
Colorado or Montana. Repairs damage very readily. 
15. Hemiock (Tsuga canadensis Linn.; Carr.). 
Height, 80 feet +; diameter, 3 feet +. Northern 
and Eastern States. Best development probably in 
