State Boatid of Fokestr\. 71 



The work of Messrs. Taylor and Brodie indicate the following 

 results by species: 



Birch. — The average rate of growth in the material examined 

 was .1 inch per year, the period of most rapid and uniform growth 

 being from the tenth to the seventieth year. The taper is 2.2 

 inches for every ten feet. In the specimens examined no absolute 

 conclusion can be drawn as to the age at which profitable growth 

 ceases, although a study of the curve would indicate it to be at 

 about the one hundred twenty-fifth year. 



Chestnut. — The average growth rate is .2 inch per year, the 

 period of most rapid growth being from the tenth to the fiftieth 

 year, although in some specimens the growth becomes less as early 

 as the thirtieth year. The taper is 1.4 inches for each ten feet. 



Beech. — The beech grows extremely slowly, showing an average 

 in the specimens studied of only .07 of an inch per year. Its period 

 of most rapid growth is from the first deeade to the fourteenth 

 and apparently profitable growth ceases at approximately one 

 hundred eighty years. The taper is 1.2 inches for each ten feet. 



White Ash. — The white ash shows an average growth rate of 

 .1 of an inch per year, the period of rapid growth being from the 

 tenth to the sixtieth year. At sixty years the annual growth rate 

 decreases and profitable growth ceases at approximately ninety 

 years. White ash has a taper of 1.6 inches for each ten feet. 



Black or Pignut Hickory. — This species in the region under 

 consideration is an extremely slow grower, showing an annual 

 growth rate of only .08 of an inch. Its growth is very uniform, 

 although in the specimens studied its most rapid growth seemed 

 to take place between the one hundredth and one hundred thirtieth 

 years. It is probable from an examination of the curve that profit- 

 able growth ceases at about one hundred fifty years. The taper is 

 1,2 inches for each ten feet. 



Shellhark Hickory. — This species shows an annual growth of 

 .05 of an inch. Its growth is quite uniform, being perhaps slightly 

 more rapid between the seventieth and the one hundred twentieth 

 years. Profitable growth ceases at about the close of this period 

 of rapid growth. The taper is 1.2 inches for each ten feet. 



Black Walnut. — This species shows an annual growth rate of 

 .16 of an inch. The growth is uniform up to the fortieth year, the 

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



