W(cwt) = 0.4422 +0.00l305(D^-H-SC2o) -0.1990(C) 

 s.e. = ±0.272. 



The units of the variables are: 



D = diameter at breast height in inches 

 H = total tree height in feet 



SCgQ = specific gravity of the outer 20 rings of an increment core taken at 

 breast height . 



C = crown class coded as: 



. Dominant = 1 Intermediate = 3 



Codominant = 2 Suppressed = 4 



The average of the absolute percentage deviations was 11.3 percent of the tree weight. 

 By comparison, a similar cubic-foot volume table with arguments of height and diameter 

 prepared by the author had an average absolute percentage deviation of 9 . 8 percent . 



LITERATURE CITED 



Duff, G. H., and Norah J. Nolan 



1953. Growth and morphogenesis in the Canadian Forest Species . I. The controls of cam- 

 bial and apical activity in Pinus resinosa Alt. Canad. Jour. Bot. 31: 471-513. 



Gilmore, A. R., G. E. Metcalf, and W. R. Boggess 



1961. Specific gravity of shortleaf pine and loblolly pine in Southern Illinois. Jour. 

 Forestry 59: 894-896. 



Goggans , James F . 



1961 . The interplay of environment and heredity as factors controlling wood properties in 

 conifers with special emphasis on their effects on specific gravity. North Caro- 

 lina State College, School of Forestry, Tech. Rpt. No. 11. 56 pp. 



Larson, Philip R. 



1960. A physiological consideration of the springwood-summerwood transition in red pine. 



Forest Sci. 6: 110-122. 



Richardson, S. D. 



1961 . A biological basis for sampling in studies of wood properties. Tappi 44: 170-173. 



Smith, Diana M., and Mary C. Wilsie 



1961. Some anatomical responses of loblolly pine to soil-water deficiencies . Tappi 44: 

 179-185. 



Wahlgren, Harold E., and Donald L. Fassnacht 



1959. Estimating tree specific gravity from a single increment core. U.S. Dept. Agr. 



Forest Service, Forest Products Lab. Rpt. No. 2146. 24 pp. 



Zobel, Bruce, Faye Henson, and Charles Well 



1960. Estimation of certain wood properties of loblolly and slash pine trees from breast 



height sampUng. Forest Sci. 6: 155-166. 



11 



