534 JOURNAL OF FORESTRY 



These formulas may Ije readily tested by the age-hei^ht-diameter 

 tables which follow. 



(D) The actual height of trees on any stump-radius, during long 

 periods of their steady growth, as related to their greatest still air 

 height, H, on the same radius, are about as follows: 



California cedars, from 80th to 380th year h=0.24H 



California bigtree, from 40th to 400th year h=0. 2AH 



California redwood {Sequoia sempervirens) , to 40th year.. . . h = 0.3lH 



Shortleaf pine, from 30th to 100th year h = 0.32H 



Southern pines, from 40th to 180th year h = 0.33H 



Michigan white pine, from 60th to 230th year h = 0.36H 



Pennyslvania white pine, from 40th to 230th year h = 0.36H 



Average American white pine, from 40th to 230th year. . . . h=0.36H 



Wisconsin white pine, from 40th to 110th year h=0A2H 



Wisconsin white pine, from 110th to 200th year h = Q.32H 



California yellow pines, from 80th to 200th year h = 0.36H 



California sugar pine, from 80th to 400th year (about) .... h=0.35H 



Tennessee white oak, from 40th to 200th year h=0.36H 



Louisiana cypress (age table not available) h = 0. 36H 



Oregon Coast Douglas fir, from 40th to 140th year h = 0.37H 



Oregon Coast Douglas fir, from 140th to 300th year h = 0A4H 



Maryland cypress, from 35 feet to 100 feet high h = 0.5lH 



Maryland cypress, from 100 to 130 feet, h drops from 0.51// to 0.36H 

 (Age table not available for cypress) 

 "Bigtrees," popularly esteemed our tallest trees, drop steadily in 

 relative height from youth to old age. Douglas firs behave in just the 

 opposite way, and redwoods are not in the same class with Douglas firs 

 for relative height. See special tables following. The tallest bigtree 

 measured by the Forest Service was 300 feet tall on a diameter of 123 

 inches, whereas the tallest Douglas fir measured was 330 feet high on a 

 diameter of only 71 .6 inches. 



(E) In proof of the preceding statements the following table of 

 values of E and w will be used. It was furnished by Mr. T. R. C. Wilson, 

 of the Government Lumber Testing Laboratories at Madison, Wis. 

 The values of E and w were obtained from tests on small clear speci- 

 mens of green material, freshly cut. The last column in this table is 

 the value of _ 



1.97l^=///^P, by {A) 



