72 Eleventh Annual Report 



years. After the eightieth year its growth rate decreases sharply 

 and profitable growth would cease at approximately one hundred 

 to one hundred and twenty-five years. The taper of walnut is 1.6 

 inch for each ten feet. 



Red or Sweet Gz^r^L— The annual growth rate of this species is 

 .12 of an inch. The growth is uniform and rapid up to about the 

 seventieth year. At about one hundred years the growth rate de- 

 creases so sharply a^ to make it fairly certain that under the con- 

 ditions existing at the State Forest Reserve profitable growth would 

 end at that age. The taper is 1.6 of an inch for each ten feet.. 



Yellow Poplar or Tulip Tree.— This species shows an annual 

 growth rate of .22 of an inch. The rate of growth is uniform and 

 rapid from the tenth to the fortieth year. Profitable growth does 

 not cease until about the one hundredth year. The taper is 1.2 

 inches for each ten feet. 



Black or Sour Gum.— This is another slow growing species, 

 showing an average annual growth rate of .08 of an inch. Its 

 growth is uniform from the tenth to the one hundred and twentieth 

 year and its profitable growth apparently continues far beyond 

 that time. The taper is 1.2 inches for each ten feet. 



Scrub or Jersey Pine.— This species shows an average annual 

 growth rate of .16 of an inch. The growth is uniform up to the 

 fortieth year, at which time the annual increment decreases. The 

 period of most rapid growth is from the tenth to the fortieth 

 years. While these pines attain considerable size on the "Knobs" 

 the large trees are almost invariably ''doty" at the base, so that 

 the species, in spite of its apparent promise, is not an especially 

 desirable one to plant or encourage. The taper is .4 of an inch for 

 each ten feet. 



Sycamore.— The sycamore shows an average annual growth rate 

 of .2 of an inch. The most rapid and uniform growth is from the 

 tenth to the fortieth year. After the sixtieth year the annual 

 growth rate decreases rapidly. The taper is 1.2 inches for each 

 ten feet. 



White Oak.— White oak shows an annual growth rate of .08 

 of an inch. The period of the most uniform and rapid growth is 

 from the twentieth to the one hundredth years. The curves derived 

 from the specimens studied do not indicate at what time profitable 

 growth ceases. The taper is 1.6 inches for each ten feet. 



