State Board of Forestry. 



TABLE I. 



75 



Species. 



Average 



Diameter. 



Six Inches. 



(Posts.) 



Years. 



Ave. Diameter 

 Eight Inches. 

 (Handle, Ex- 

 tract, Pulp, 

 Spools, Props, 

 Fuel Wood.) 

 Years. 



Ave. Diameter 



Twelve Inches. 



(Ties, Poles. 



Saw-timber). 



Years. 



Birch 



Chestnut 



Beech 



White ash . 



48 

 29 

 75 

 44 

 95 

 100 

 32 

 28 

 48 

 74 

 25 

 60 

 60 

 42 

 41 

 48 

 44 

 27 



60 

 42 



100 

 70 



120 



150 

 45 

 38 

 60 



100 

 35 

 70 

 80 

 54 

 52 

 58 

 57 

 35 



100 

 60 

 150 

 110 



Black hickorv 



150 





210 



Black walnut • 



70 



Yellow poplar 



60 

 100 





150 



Scrub pine 



80 

 94 



White oak 



120 



Scarlet oak 



80 



Chestnut oak 



80 



Red oak 



84 



Black oak 



73 



White elm. 



56 







These figures, it must be borne in mind, are based in each case 

 upon an examination of only ten specimens and are to be regarded 

 as indicative rather than as absolute statements as to the exact 

 number of years required to reach the diameter mentioned. The 

 figures represent the average growth rate of ten individual trees 

 of each species under the conditions described earlier in the paper. 

 For such regions there is little doubt that the shellbark and black 

 or pignut hickories are the most slowly growing forms, while the 

 scrub pine, chestnut, yellow poplar, black walnut and white ash 

 are those which luider the conditions named show the most rapid 

 growth. It is probable also that the ratio existing between these 

 growth rates is expressed with practical accuracy in the results 

 given. 



It is beyond question that under proper management the di- 

 ameters named would be attained in a much shorter time. In a 

 strong, loose, properly drained soil, with proper management the 

 time required would be very greatly reduced. This conclusion is 

 borne cut by the results obtained in the experimental plats at the 

 Forest Reserve. An examination of the reports of the Secretary 

 upon these plats is sufficient justification for this conclusion. A 

 study of Table 1 will indicate promising species for post stuff, for 

 handles, pulp, props, fuel wood, and ties. These species may well 

 be encouraged and given the care necessary to secure their most 

 rapid growth. 



