186 



PRODUCTIVE FARMING 



3. Tender kinds, such as Scotch pine, do much better 

 when partially protected by more hardy trees. 



4. Mixed plantings are more beautiful and interesting. 



5. Birds are attracted by the greater variety of food and 

 shelter. 



6. The ground is usually better shaded by mixed planting. 

 Tall trees with thin foliage, such as maple and birch, may be 



FIG. 93. 



FIG. 94. 



FIG. 94a. 



FIG. 93. A pine tree growing in an open place, holding the leaves out to the 

 light. 



FIG. 94. Pines and other trees grown in a dense forest, which is now mostly 

 cleared away. 



FIG. 94a. Sugar maple tree yields sap in early spring. 



alternated with those which have dense foliage and can 

 endure shade well, such as spruce and beech. 



EXERCISE. Distance Apart and Shape. In a wood-lot 

 or other place where trees are growing close together, notice 

 the distance from the ground to the first side limbs that are 

 beneath the shade of other trees (Fig. 94). Compare these 

 with trees of the same kind growing in open places. In a 

 dense forest the side limbs are shaded from the light and 



