6 Indian Forest Records. [Vol. VI 
The experiment was carried out in the Kirgaon forests of the 
Khandwa -Range during January and February 1914. 
Six sample plots were chosen, of an aggregate area of 49*2 acres ? 
containing 1,023 Roswellia trees, classed as under :— 
Girth 24" to 30" . . . . 375 trees = 8 trees per acre 
„ 30" to 36" . . . . 331 „ = 7 „ „ „ 
,, 36" and over . . . 317 = 6 ,, ,, „ 
The trees were tapped by shaving a girdle of bark off the tree, a foot 
broad to about half the thickness of the bark, and freshing at stated 
intervals. The yield after a month’s tapping, i.e., from the 21st January 
till the 23rd February, according to girth-classes, was as follows :— 
lbs. 
375 trees of 24" girth up to 30" .....= 21*26 
331 „ „ 30" „ „ to 36".- 27*88 
317 „ „ 36" „ and over .....= 37*80 
Total . 86*94 
The yield according to girth-classes per acre, per working season of 
5 months, would therefore be— 
lbs. 
Trees of 24" girth up to 30" ...... = 2*27 
„ „ 30" „ „ 36". = 2^5 
„ „ 36" ,, and over.- 3*58 
Total . 8*80 
During the first half of the operations the flow was small, increasing 
gradually after each “ freshing,” so that the estimate is probably below 
the mark. This point will be made clear when describing the North 
Khandesh experiments. In order to ascertain the correct period for 
“ freshing ” the wounds, in sample plots I and II freshing took place 
every 4th day, in III and IV every 6th day, and in V and VI -every 8th 
day. The results calculated on the yield per hundred trees of each class- 
for one month were as follows :— 
Girth 24" 
to 30". 
Girth 30" 
to 36". 
Girth 
over 36". 
Total. 
lbs. 
lbs. 
lbs. 
lbs. 
Freshing every 4th day Sample Plot I 
8*2 
13*9 
20*9 
I 
> 75*4 
99 
„ II 
5*8 
11*1 
15*5 
) 
v, „ 6th „ 
99 
,, HI 
3*8 
6*3 
8*6 
> 43*5 
„ iv 
5*1 
6*6 
13*1 
) 
) 
»> „ 8th „ 
» 
„ v 
4*6 
7*8 
8*9 
> 40*0 
99 
„ VI 
6*0 
3*7 
90 • 
) 
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