16 
BULLETIN 316, U. S. DEPARTMENT OP AGRICULTURE. 
Table 8. — Black willow — Mississippi Valley. 
Diam- 
eter 
breast- 
high. 
Inches. 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34 
35 
36 
Number of 16-foot logs. 
2h 
Volume — board feet. 
40 
51 
64 
78 
94 
110 
130 
150 
170 
200 
220 
240 
270 
69 
100 
130 
89 
120 
160 
110 
150 
190 
130 
180 
230 
160 
210 
270 
180 
240 
310 
210 
280 
350 
230 
320 
400 
260 
360 
450 
290 
400 
500 
320 
440 
560 
360 
490 
620 
390 
530 
680 
420 
580 
740 
460 
640 
810 
500 
690 
890 
530 
750 
970 
570 
810 
1,050 
600 
870 
1,140 
640 
940 
1,240 
670 
1,000 
1,330 
710 
1,070 
1,430 
750 
1,140 
1,530 
490 
550 
610 
680 
750 
830 
910 
1,000 
1,090 
1,190 
1,290 
1,400 
1.520 
1,640 
1,770 
1,900 
Diam- 
eter 
inside 
Basis. 
bark 
of top. 
Inches. 
Trees. 
10 
11 
2 
12 
3 
12 
11 
13 
9 
14 
6 
14 
12 
15 
23 
16 
25 
17 
23 
17 
23 
18 
15 
19 
15 
19 
16 
20 
9 
21 
/ 
22 
8 
22 
8 
23 
3 
24 
6 
24 
3 
25 
1 
26 
1 
229 
Tables 9 and 10 are similar to Tables 5 and 6, respectively, except 
in regard to closeness of utilization. Table 9 shows the volume based 
on diameters breasthigh from 8 to 36 inches and height classes 10 
feet apart, from 60 to 130 feet, and also the average height of trees 
of different diameters. The top diameter limit is from 6 inches for 
the 8-inch trees up to 16 inches for the 36-inch trees. The volumes 
of trees of average heights are shown in heavy-faced type. Table 
10 shows the volume based on diameters breasthigh from 8 to 36 
inches and the number of 16-foot logs per tree, scaled from taper 
curves, mostly in 16.3-foot logs, with a few shorter lengths where 
necessary. The stump height is 1 foot. The trees on which both 
tables are based were scaled with the Scribner Decimal C rule and 
the tables show what could be taken from them by close utilization. 
