356* Method of ascertaining the Value 



It is difficult in thinning plantations to leave the trees at 

 nearly equal distances. The distances stated in all these 

 tables must be considered the average distances. If, for in- 

 stance, there be 302 trees on an acre, their average distance 

 will be 12 feet, although few of them may stand at exactly 

 that distance. 



If the trees be first planted four feet apart, and be peri- 

 odically thinned out to the distance of one-fourth of their 

 height until they are 28 feet high, and to one-third of their 

 height afterwards, and that they increase 12 inches in height 

 and one in circumference annually, the number of trees on 

 an acre, and the number to be cut out at the ages and 

 heights under mentioned, and the number of feet they will 

 then respectively contain in the bole, when measured to 

 the top of the leading shoot, will be as under, viz. 



Olservations on Table IX. 

 On examining several oak woods, it appeared to me, that 

 the distance of one-third of their height was not too much 

 where the trees were from 30 to 40 feet high and upwards. 

 I have therefore calculated a table according to the distance 

 of one-fourth of their height, till they are 28 feet high, and 

 according to the distance of one-third of their height after- 

 wards. 



The 



