62 THE WHITE PINE 



basal area of the group by the number of trees. 

 The result will be the basal area of the average 

 tree, from which the diameter may easily be 

 obtained. The average height and age of a 

 group are the same as the height and age of the 

 average tree. 



Below is given a summary of the valuation 

 surveys, in which the most essential points are 

 noted. It will be seen that in most cases only 

 the generic name is given, and that the names 

 of the species in mixture are abbreviated. The 

 abbreviations are as follows : 



A. Ash I. Iron wood (Ostrya vir- 



B. Birch giniana, K. Koch.) 

 Bch. Beech JP. Jack or Pitch Pine 

 Ced. White Cedar {Thu- M. Maple 



ja occidentalis, L.) NP. Norway Pine 



Ch. Chestnut O. Oak 



Cy. Black Cherry Pop. Poplar 



Fr. Balsam Fir Sp. Spruce 



Gm. Black Gum Tu. Yellow Poplar or Tulip 

 H. Hickory Tree 



Hm. Hemlock 



