LONGLEAF PINE. 
25 
of 9.6 pounds per face, of which 8.3 pounds were dip and 1.3 pounds 
scrape. The timber as a rule is old and very slow growing, but was 
worked conservatively. 
UNPROFITABLE TURPENTINE PRACTICES. 5 
Working small-sized frees. — The figures given in Table 12 refer 
to young longleaf pine timber in southern Georgia, and show the 
weight of gum in cups ready for the first dip after six streaks. The 
trees ranged from 7 to 12 inches in diameter (measured at breast 
height, or 44 feet above the ground) ; each tree was hung with one 
cup and was being worked for the first year. The production for 
the season is computed on the assumption that there were six dip- 
pings. 
Table 12. — Yield of gum per cup in tlie first dip, and computed yield for the 
season from different-sized trees. 
Diameter 
of tree 
( breast 
high). 
Yield of gum per cup. 
Per dip (6 
streaks). 
Per 
streak. 
Per sea- 
son, 6 
dippings 
(com- 
puted). 
Inches. 
17 
18 
19 
110 
ill 
112 
2 10 
2 11 
2 12 
Ounces. 
10.0 
15.0 
19.0 
22.5 
23.0 
24.0 
36.0 
43.0 
48.0 
Ounces. 
1.7 
2.5 
3.2 
3.7 
3.8 
4.0 
6.0 
7.1 
8.0 
Pounds. 
3.7 
5.7 
7.1 
8.5 
8.7 
9.0 
13.5 
16.1 
18.0 
One-cup trees. 
2 Two-cup trees. 
The most noteworthy point here is that a 7-inch tree yields less 
than one-half the gum yielded by a 10-inch tree, Of the 10-inch trees 
those with two cups yielded 60 per cent more gum than those having 
only one cup ; of the 11-inch trees, they yielded 87 per cent more ; and 
of the 12-inch trees, they yielded 100 per cent more. In operations 
on small timber the expense of cups, hanging, chipping, and dipping 
is incurred in connection with many trees that yield only about a 
quart of gum for a full season's working. Even smaller returns than 
those shown above are not uncommon. In May, 1920, third-year 
workings of these small sizes were found that yielded at the rate of 1 
ounce of gum to each four streaks. The conclusion arrived at from 
these weighings is that, in general, timber less than 9 inches in 
5 The discussion is based upon studies and recommendations by Austin Cary, Logging- 
Engineer of the Forest Service. See also " New Method of Turpentine Orcharding," For- 
est Service Bulletin 40. For sale by Superintendent of Documents, Government Printing 
Office, Washington, D. C. Price, 10 cents. 
S5927°— 22 4 
