2 
Indian Forest Records. 
[VoL. IX 
PART I. 
The Essential Oil from the Oleo'^resin of Pinus Khasya. 
The oleo-resin from Pinus Khasya from Burma has already formed 
the subject of a number of previous investigations. Armstrong (Pharm. 
Journ. 1891. 3. 21, 1896. 56. 370.) would appear to have been the first 
to examine this oleo-resin, whilst subsequently it was investigated by 
Puran Singh in these laboratories. Full details of the results of 
these previous investigations are to be found in Forest Bulletin No. 24 
(1913). In this paper the geographical distribution and the quantity 
of Pinus Khasya for tapping available are fully dealt with so that 
further reference to these subjects is unnecessary here. 
The high quality of the turpentine was recognised by previous invest- 
igators who further suggested, that it consisted essentially of a- 
pinene but afforded no proof of this beyond the physical constants. 
• For the experiments described below a large quantity of the oleo-resin 
was distilled on a commercial scale at Jallo and the bulk oil immediately 
sealed up in tins and forwarded to the authors for examination. The 
following are the details of the results of the distillation of the oleo- 
resin : — 
104-7 marmds of the oleo-resin were distilled and 164 gallons of tur- 
pentine were obtained which represented 1-6 gallons of turpentine per 
maund of resin as compared with a yield of 2-0 gallons from a maund of 
the oleo-resin of P. longifolia. On re- distillation in steam under the 
ordinary conditions adopted at the factory the following results were 
obtained : — 
Turpentine [uality I. 1-30 gallons per maund of crude resin. 
>> >> tl* 0‘13 ,, ,, ,, ,, 
>> »j III. O'lO ,, ,, ,, ,, 
Loss on re-distillation 0-07 ,, ,, ,, ,, 
Total 1-6 
The rosin yield was : — 
Clean rosin 53-42 maunds (51 per cent, by weight of crude resin treated). 
Dirty rosin 6-33 maunds ( 6 per cent. ,, ,, ,, „ ). 
Total 59 8 maunds (57 per cent. ,, ,, ,, ,, ). 
(One maund is equivalent to 82 lbs.) 
As compared with P. longifolia, which yields 70 per cent, of rosin, 
the yield is somewhat poor, whilst the proportion of dirty rosin to 
[ 112 1 
