50 



TABLE No. 22. Normal Yield per Acre, in Cubic Feet 

 and Cords, of Better Second Growth Hardwood Stands 

 in Central New England. 



SITE CLASS I. 

 All trees 2 inches and over in diameter. 



First published in Harvest Forest Bulletin No. 2, " Growth Study and Normal 

 Yield Tables for Second Growth Hardwood Stands in Central New England," 

 J. Nelson Spaeth. Data gathered in northern Worcester County, Mass., in 1919. 

 Based on forty fully stocked, natural, even-aged sample plots containing over 

 15,000 trees. The principal species were red oak, white ash, red maple and bass- 

 wood. Cubic foot and cord volumes were obtained by the use of Harvard Forest 

 Revised Red Maple Volume Tables (tables 15 and 16 in this Handbook); board 

 foot volumes were computed by the use of Clark's International Log Rule (as 

 published in Graves's "Mensuration"), which agrees closely with average yields 

 from the customary round-edge sawing. Conclusions drawn from this study 

 were that, for even-aged second growth hardwood stands, in spite of wide varia- 

 tion in percentage of species in mixture, for a given site, age and density the 

 volume in board feet, cubic feet and cords is constant; also that the volume of 

 a tree of given height and diameter in cords and cubic feet is the same, regardless 

 of species. (For full discussion see original publication.) 



