108 PRINCIPLES OF AMERICAN FORESTRY. 



of contact of the twig and seedling, which are then tied 

 firmly together. It should be done by the middle of 

 June, but will often be successful if done even a month 

 later. They should be kept together until the leaves 

 fall, and then the branches from the parent tree should 

 be cut away ? leaving the seedlings with the twigs grown 

 fast to them. These should be carefully heeled-in over 

 winter, and in the spring the seedlings should be cut off 

 just above the union, so as to throw all their strength 

 into the adopted twig of the Cutleaf Birch. This method 

 may also be used to replace lost branches on trees or vines. 



