6 
Indian Forest Recm'ds. 
[VoL. IX- 
PART n. 
The Essential Oil from the Oleo-resin of Pinus excelsa. 
In a short communication from these laboratories (Pman Singh. 
Forest Bulletin. No. 24. (1913) ) brief mention was made of the turpen- 
tine distilled from the oleo-resin of Pinus excelsa. The constants of the 
oil were determined whilst the distribution of and the approximate area 
under P. excelsa were also given. No attempt however was made to 
determine the constituents present in the oil and in view of the 
interesting results obtained in the investigation of the turpentines from 
P. longifolia and P. Khasya it was decided also to examine this oil. 
Through the kindness of Mr. Guest a quantity of the oleo-resin of 
P. excelsa was distilled at the Government Turpentine Factory at Jallo 
and Mr. Guest has furnished me with the following table of the re- 
sults of the distillation ; for comparison the results of the distillation of 
the oleo-resins from P. longifolia and P. Khasya are also given. 
Table I. 
— 
P. e-vceha. 
P. longifolia. 
P. Khasya. 
Yield of turpentine per maund of 
resin. 
2-25 gals. 
2-0 gals. 
1'6 gals. 
Commercial fractionation. Yield 
per maund of resin. 
Quality I . . . 
2 „ 
1-4 „ 
1-3 „ 
„ n . . . 
0-3 „ 
0'13 „ 
„ m . 
... 
0-22 „ 
010 „ 
Loss .... 
... 
0-08 „ 
0 07 „ 
Yield of rosin % in crude resin. 
68 
70 
60 
From these results it is clear that the turpentine from P. excelsa is 
of excellent quality, but as the oleo-resin yield of the trees is low and they 
are also somewhat inaccessible, it is doubtful if it is commercially feas- 
ible to undertake the distillation. 
[ 116 ] 
