Part VI.] Preparation of Turpentine,^Rosin and Gum. 9 
“ (3) Details of the gum-oleo-resin collected from the trees in 
Experiment A are given below :— 
Net quantity of 
GUM COLLECTED, 
Girth of trees. 
Serial 
No. of 
trees. 
IN 
oz. 
Total 
collection, 
in oz. 
Average 
total 
Remarks. 
June. 
July. 
collected 
per tree, 
in oz. 
tc 
r+- 
O 
05 
© 
1 to 15 
Pi 
12-4 
15-6 
s 
1-04 
Originally 
bruised. 
Do. 
16 to 30 
2-4 
.9-6 
12-0 
0-80 
Not 
bruised. 
30* to 36" 
1 to 15 
2-0 
12-4 
14-4 
0-96 
Originally 
bruised. 
Do. 
16 to 30 
3-6 
18**4 
22-0 
1*46 
Not 
bruised. 
Above 36" 
1 to 15 
4-0 
11*6 
15*6 
1-04 
Originally 
bruised. 
Do. 
16 to 30 
5*6 
11*2 
16-8 
M2 
Not 
bruised. 
Total 
IN oz. 
20-8 
75*6 
96-4 
Average. 
107 
No. of collections 
5 
4 
9 
/ 
Thus the average total yield of gum-oleo-resin per tree was 107 or 
per collection 1H=0*12 oz. 
6i (4) In Experiment B, thirty trees were tapped in December in each 
of the three girth-classes, as in Experiment A, and the drip 
was collected and the wounds were freshed approximately 
every 5th day, until the end of the June 1917, when the 
experiment was stopped. The freshing consisted of 
removing a thin layer of bark from the upper half of the 
wound, and by removing a further J inch or so of the bark 
from above the old wound. At the same time, throughout 
the experiment, the bark above the freshed wounds of 
trees Nos. 1—15 in each girth-class was bruised by gentle 
hammering. 
[ 311 ] 
