196 



REPORT OF THE 



Ftitare ^tand of 3prQCe. 



A study of the rate of growth of Spruce has beeu made by the Division 

 of Forestr}^ in several parts of the Adirondacks, in both cut-over and virgm 

 forest. Similar measurements of growth were made on Township 39, 

 under forest conditions closely resembling those on Township 40. By 

 means of these measurements, it was possible to select from the several 

 tables compiled by the Division of Forestry, showing the rate of growth of 

 Spruce, that which applies most closely to the Spruce upon Township 40. 

 The table chosen and given below was made from measurements taken at 

 Tahawus, Essex County, New York, on land where the conditions of growth 

 of Spruce were sufhciently similar to those on Township jo to make safe 

 its application to that tract. The increased increment which followed the 

 opening of the forest by lumbering has been disregarded, in order to insure 

 a thoroughly safe and conservative estimate. The table chosen was com- 

 piled from analyses of 461 trees. 



The following table shows the average annual increase in diameter for 

 Spruce of various sizes, and the number of years required to grow one inch: 



TABLE No. 17.— RATE OF GROWTH IN DIAMETER OF SPRUCE. 



Diameter breasthigh. 



Annual growth. 



Time required to grow one inch. 



Inches. 



Inches. 



Years. 



3 



.0460 



22 



4 



.0605 



17 



S 



.0718 



14 



6 



.0825 



12 



7 



•0933 



II 



8 



.1040 



10 



9 



.1150 



9 



10 



.1260 



8 



11 



■1350 



7 



12 



• 1425 



7 



13 



.1485 



7 



14 



•1545 



6 



IS 



•1595 



6 



16 



.1645 



6 



17 



.1685 



6 



18 



.1725 



6 



