48 WORKING PLAN, LANDS IN BERKELEY COUNTY, 8. 0. 
XVI (age on basis of diameter) how large these trees will be at the 
end of ten, twenty, thirty, forty, and more years. The contents of 
these trees ‘is then calculated from the volume tables, the result giving 
the yield in board feet at the end of each decade. ‘ 
As shown in Table XXII, the second cut of timber after ten, twenty, 
or thirty years is greater with a diameter limit of 14 inches than if a 
diameter limit of 16 inches be adopted. Raising the diameter limit 
usually results In increasing the second cut of timber which may be 
expected after a given period. That this does not happen on the 
Cooper River timberlands is explained by the fact that in cutting to 
14 inches the trees left standing which will become merchantable if 
the second cut to the same diameter limit is made after ten, twenty, or 
thirty years will yield more board feet of lumber at the end of the 
period than will those left if the diameter limit is set at 16 inches for 
both cuttings. 
This is because the number of trees of small diameter which will 
become 14 inches but will not become 16 inches in diameter within 
the given period more than offsets the timber produced by trees 14 
and 15 inches in diameter. 
TaBLE X XII.—Present and future yields of pine per acre, and time required before a yield 
equal to the present may again be obtained. 
Time 
Cutting | | | | before a 
limit, | Present Yield Yield Yield Yield Yield | yield 5 
diameter) yield | after10 | after 20 | after 30 | after40 | after 50 | equal to 
breast- | peracre.| years. -| years. years. years. years. | present 
high. | may be 
obtained. 
Inches. | Bd. feet. | Bd. feet.| Bd. feet.| Bd. feet.| Bd. feet. | Bd. feet. | Years. 
10 | 3 3, 318 5, 758 8,143 | 10,648 31 
12 | 5,385 1, 098 3 416 6,566 9,362 | 12,640 25 
14 4.729 1, 263 3.753 8,293 | 11,086 | 14,543 22 
16 4,021 1,124 2) 165 7,697 | 11,968 | 15,670 99 
SUSTAINED ANNUAL YIELD. 
In estimating the amount of land necessary for a sustained annual 
yield, it is assumed that land,if acquired, will be of the same character 
as that now owned by the company. 
Since the chances for a second crop of cypress are small (on account 
of its scant reproduction and slow growth), and since most of the hard- 
woods are at present unmerchantable, these are not considered in this 
calculation. The company at present does not intend to cut over 
20,000,000 board feet per year from their own land, but the mill, if 
running at full capacity, might easily handle 40,000,000 feet. 
In Tables XXII, XXIV, and X XV is shown the amount of land 
necessary for a sustained annual yield of 20, 30, and 40 million board 
feet of pine, cutting to different diameter limits; and the amount 
necessary, cutting to 14 inches, with a 30-year rotation. The amount 
