STOCKING THE GROUND 109 



where growth usually starts earlier than on northern 

 slopes. 



After a spell of dry weather the damage is more likely 

 to be severe than during wet weather. The damage, too, 

 varies on different soils, moist sands being much worse 

 than clay. 



Pure or Mixed Plantations. 



There are several things to be considered before this 

 point can be decided. Some trees are shade-bearing; 

 some will endure shade from light-foUaged trees such as 

 Larch; others are light-demanding. 



Shade-hearing Qualities of Trees. 



Shade-bearing Trees: Norway Spruce, Sitka Spruce, 

 Silver Fir, Hornbeam, Beech. 



Trees tolerant of Light Shade: Spanish Chestnut, 

 Sycamore, Lime, Douglas Fir, Thuja gigantea, Corsican 

 Pine, Weymouth Pine, Alder. 



Light-demanding Trees: Larch, Scots Pine, Oak, Ash, 

 Elm, Poplars, Willows, Birch. 



Soil-improving Qualities of Trees. 



Some trees improve the soil by their heavy fall of 

 leaves and protect it by their heavy shade. 



Beech, Hornbeam, and in a less degree Sycamore, 

 Maple, Spanish Chestnut, are soil-improvers, while the 

 same trees, with Spruce, Silver Fir, Douglas Fir, by their 

 density of foliage, are soil-protectors. 



Larch, Oak, Ash, with others, allow too much light 



