LAWS OF TALL-TREE GROWTH 537 



Species. These statements do not represent actual measurements, and 

 are hardly more than guesses. And the maximum height given does 

 not correspond to maximum diameter. From Forest Service Bulle- 

 tin 38, p. 12, it would appear that a redwood (Sequoia semper vir ens) 

 has reached a height of 350 feet on a diameter of 20 feet. The still- 

 air height for a redwood of that diameter is 1,456 feet. This tree had 

 reached one-fourth of it and would be a normal tree. See table (F). 

 And from Forest Service Bulletin 22, p. 27, a white pine has gotten to be 

 200 feet tall on a diameter of 5 feet. The still-air height for a white 

 pine of this diameter is 573.5 feet, and this tree had reached 35 hun- 

 dredths of this height, and was a normal tree. See table (F). These 

 two cases are the only ones I have found in which the diameter of the 

 "tallest" tree was given. The tallest trees of a species are usually 

 abnormal. I have ventured in the second colimm of the following 

 table to estimate the diameter of these "tallest" trees from the behavior 

 of the species as developed in this paper. In the fourth column I have 

 given the still-air height for the maximum diameter. 



Probable Maximum Maximum still- 

 Maximum height, diameter, diameter air height, 

 feet inches feet feet 



Douglas fir 380 76 15 1,357 



Redwood {sempervirens) . . . 350 137 . . .... 



Western yellow pine 200 45 8 733 



White pine 200 47 7 718 



Longleafpine 200 44 4 523 



Norway pine 150 ... 5 609 



Cypress 150 38 12 981 



White oak 150 40 8 701 



Shortleaf pine ... ... 4.5 557 



Red cedar ... ... 6 732 



(7) Proof of the foregoing statements, other than {A), will be ob- 

 served by noting the behavior of the value of the ratio of h to the cube 

 root of the square of r, in the third column of the following tables, for 

 the different species. This ratio keeps fairly constant over long periods 

 for all species. And the fourth column expresses the height {h) at any 

 time in terms of (//), the greatest still-air height for the corresponding 

 value of r (stump-radius). Through long periods h maintains a con- 

 stant ratio to H, for each species. The value of h is expressed in feet 

 and that of r in inches, as agreed in (.4). 



