average age of 15 : r ears the seedlings were 1.27 

 inches in diameter and 3^7 feet high, while iso- 

 lated seedlings grown in the sagebrush one-half 

 to one mile from the edge of the border forest 

 showed that at an average age of 15 years the seed- 

 lings were 1.36 inches in diameter and 55^ ^eet in 

 height. These figures show very strikingly the re- 

 lation of moisture to growth, of Yellow Pine in this 

 region. The amount of available moisture due to 

 elevation is greater in the case of the first sead- 

 lings, while that of the seedlings grown on the 

 edge of the Forest and those isolated ones grown 

 in the sagebrush is probably about the same - and 

 since there are more trees to use/ the moisture on 

 the edge of the forest than in the sagebrush, 

 there is not as much available for each individual 

 tree and sonsequently it does not make as rapid 

 growth. 



The tree is rather long lived, the av- 

 erage age of maturit^r being about 35 years. The 

 largest and oldest tree analyzed up to the present 

 time on tiiis Forest was 45 years old, 12 5 feet 

 high, 54 inches in diameter at breast height and 

 scaled 6630 feet B. ?'. "toy the Scribner, Decimal C 

 log scale. The maximum diameter recorded on the 



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