17 



NOTES TO TABLE 12. 



The term, "stem analysis," designates a well established 

 method of determining the exact size of a tree in a given year 

 ol its life time. 



I applied this method, combined with graphical interpola- 

 tion, to ?0 poplar trees, growing cii various soils and expos- 

 ures, and ascertained what logs 12 feet, 14 feet or 16 foet long 

 and scaliag 14 inches or more 'at the smiall end might have 

 been obtained from each tree whesn 100, 120, 140, 160, etc., 

 years old. Adding the contents of these logs for a given age 

 and given conditions of growth, I arriveid 'ajt the data put to- 

 gether in the following table. 



By "Conditions of growth" is understood the influence of 

 soil, moisture and exposure upon tree growth. 



Yield tables, such as table 12, have only a local value. There 

 cannot be any doubt that the growth of yellow poplar in 

 Crockett County, Tennessee, far excels that in. Hemd'erson and 

 Transylvania 'Counties of Western North Carolina, for which 

 table 12 and all the following tables based thereon are claimed 

 to hold good. 



Under average conditions of growth, trees Itess than 140 

 years old, and under poor conditions of growth trees less than 

 about 220 years old are not fit for thfe saw. 



Trees scaling 1000 feet B. M. can be grown only in the 

 course of at least two centuries. 



The annual growth of a tree from its ISO-th year on, gen- 

 erally spealdng, amounts to about 10 feet B. M. 



