DESCRIPTION OF TREES. 



165 



heavy weight of snow and ice. To avoid this, only one 

 leader or main branch should be allowed to grow at first, 

 and all laterals tending to outgrow the leader should be 

 headed in to keep a good balance of the tree. Some very 

 fine trees are grown from seed of the cut-leaved varieties, 



FIG. 84. WIER'S CUT-LEAYED MAPLE (Acer dasycarpum 

 laciniata pendula). 



but the best forms must be obtained by grafting upon the 

 common silver-maple stock. 



CUT-LEAVED WEEPIXG BIRCH (Betula alba, var. laciniata 

 pendula)) Fig. 85. On account of its rapid growth, the 

 ease with which it is transplanted, and its great beauty, 

 both iii winter and summer, this is one of the most satis- 



