18 
BULLETIN 1061, U. S. DEPARTMENT OF AGRICULTURE. 
be sawed out by using the tree above a 1-foot stump and down to 
a top diameter of 4.G inches. It is the form of utilization now gen- 
eral in parts of New England. Another column shows the amount 
of lumber yielded per acre according to the Doyle log rule — which 
is in common use in the South — and the difference is striking. Tab- 
ulated information of this kind will be found useful in predicting 
the amount of growth that may be expected to take place during a 
specified period — 5 years or multiples thereof — upon different qual- 
ities of situation or classes of land. On medium land, for ex- 
ample, well-stocked longleaf stands at 40 years of age have been 
found containing an average of 6.200 board feet, and these may be 
expected to grow 1.200 board feet during the next 10 years, at which 
time they will contain a total of about 10.400 feet. On good land, 
or favorable situations, measured 40-year-old stands, well stocked 
with trees, have contained an average of about 11.000 board feet, 
increasing during the next 10 years by about 5.200 board feet, to a 
total of 16.200 feet at 50 years of age. The caution is here repeated 
that these are fully stocked stands and very much better than the 
average (PL VII). The degree of stocking, or the amount of un- 
used space in the stand, should be taken fully into account in esti- 
mating any piece of timber. 
Table 
-Amount of saw timber in board feet grown in lo-ngleaf pine stand's 
that are even aged and well stocked with trees. 
Age 
of 
stand. 
Mill scale, or 
actual cut . 
Doyle rule. 
Trees 10 inches and 
diameter. 
over in 
Trees 8 
nehes and 
diameter. 
over in 
Trees 7 
inches and over in 
diameter. 
Better 
land. 
Medium 
land. 
Poorer 
land. 
Better 
land. 
Medium 
land. 
Poorer 
land. 
Better 
land. 
Medium 
land. 
Poorer 
land. 
Years. 
30 
35 
40 
45 
50 
55 
60 
65 
70 
5, 900 
8,500 
11.000 
13.600 
16, 200 
Is. Min 
21,400 
23. 700 
25.800 
1.200 . 
3. 800 . 
6,200 
S.400 
10, 400 
12, 400 
14. 400 
16. 200 
17.900 
10,800 
14. 200 
17.100 
19.600 
21,800 
23,700 
25, 3CO 
26. 900 
2^.900 
5,700 | 
8,200 ' 
10. 400 
12, 600 
14,400 
16,000 
17, 400 
18,800 
20,200 
700 
2, 200 
3,800 
5,300 
6.900 
8,200 
9.500 
10. 700 
11.900 
3,500 
4. 800 
6.200 
1, 600 
9,000 
10. 300 
11,600 
12,900 
14,200 
1,900 
2,900 
4,000 
5,000 
6.100 
7,200 
8,200 
9,200 
10,200 
300 
1.000 
1.700 
2.500 
3.200 
4,000 
4.700 
5,500 
6,200 
1,500 
3,100 
4,600 
6.100 
7, 500 
S. Mill 
10.000 
The final yields here shoAvn, it should be noted, are the full con- 
tents of the stand at the assigned ages and do not include timber 
that may have been produced previously, or the intermediate yield, 
often a very considerable amount. This is the product of any thin- 
nings that may have been made (see under "Cutting") and of the 
timber that has died out during the life of the stand. With advance 
in the age and size of the trees there comes a natural reduction in 
the number of trees by the weaker giving way. The process may 
