SUSTAINED ANNUAL YIELD. 49 
of land required varies with the yield per acre; the greater the yield 
the smaller the area, necessarily. 
Tables XXIII, XXIV, and XXV show how many acres must be 
added to the present holdings of the company to secure an output 
from the mills of 20, 30, or 40 million board feet per year during the 
period of the second cut, provided the added acreage is of the same 
character as that now owned. | 
TasLeE X XIII.—Sustained annual yield of 20,000,000 board feet of pine. 
Time re- es 
_ Cutting | | Time re- | quired be- | Total area aude 
limit’ | Annual | Area to be| quired to |fore second necessary | 27 t0 “3 
diameter! yield per| logged | cutover yield equal for sus- sec 
breast- | acre. | annually.| present | to firstcan tained an- Nic at 3 
high. | | tract. | beob- j|nual yield,| “mecan-| 
| | dated. nual yield. | 
| 
Inches. |Board Jeet. Acres. Years. Years. Acres Acres. 
10 6, 033 3, 315 12 31 102, 765 63, 065 
12 5, 385 3, 714 10.7 25 92, 850 53, 150 
14 4,729 4,229 9.4 2 93, 038 53, 338 
16 4,021 4, 974 8 22 109, 428 69, 728 
Taste XXIV.—Sustained annual yield of 30,000,000 board feet of pine. 
| Time re- 
Cutting Time re- | quired | Total area ‘Adaitional| 
|_limit, | Annual | Area to be| quired to | before sec-) necessary | 10° 10% 
idiameter| yield per} logged cut over | ond yield | for sus- a 
breast- | acre. | annually.| present | equal to | tained an-| ,.57) bed 
high. | tract. first can be | nual yield. acsearle 
| | obtained. | ao 
Inches. | Bad. ft. | Acres. Years. Years. Acres. Acres. 
10 6,033 | 4,973 8.0 31 154, 163 114, 463 
a2 5, 385 | 5,571 rey 26 189, 275 99,575 
14 4,729 6, 344 6.3 22 189, 568 99, 868 
16 4, 021 | 7,461 5.3 22 164, 142 124, 442 
TaBLE XX V.—Sustained annual yield of 40,000,000 board feet of pine. 
| 
Time re- | aga 
Cutting Time re- | quired | Total area poticn ae 
limit, di-| Annual | Area tobe} quired to | before sec-| necessary a See 
ameter | yield per| logged | cutover | ond yield | for sus- : = reg 
breast- acre. annually. | present equal to | tained an- Soret ay 
high. | tract. first can be nual yield. Seine dekd 
| obtained — 
io ae) aaa 2s: | eee = 
Inches. Bad. ft. Acres. Years. | Years. Acres. Acres. 
10 6, 033 6, 630 6.0 31 205, 530 165, 830 
12 5, 385 7,428 5.3 25 185,700 | 146,000 
14 4,729 8. 458 4.7 92 | 186.076 | 146,376 
16 4, 021 9, 948 4.0 22 218, 856 | 179, 156 
