INDIAN FOREST RECORDS 
Vol. VI.] 1918 [Part VI. 
Note on the preparation of Turpentine, Rosin and Gum, 
from BosWellia serrata (Roxb.) gum-oleo-resin. 
By 
R. S. PEARSON, F.L.S., I.F.S., 
Forest Economist, 
and 
PURAN SINGH, F.C.S., 
Chemical Adviser, at the Forest Research Institute, Dehra Dun. 
INTRODUCTION. 
This enquiry was started as part of a general enquiry into Indian 
Gums and Resins in 1908, but was not actively prosecuted until 1912, 
when both laboratory and tapping experiments were inaugurated. 
The Chemical side of the enquiry was, from the first, carried out 
under considerable difficulties, owing to the absence of a suitable solvent 
still, and on this account the data obtained as to the cost of working 
still remains to be verified in an experimental factory. 
No detailed information is given regarding suitable localities in 
which such an industry might be started, though from the statements 
of outturn such localities are indicated and further information on the 
subject can be obtained, either from the Local Officers or from the 
Forest Research Institute, Dehra Dun. 
Throughout the enquiry Professor Wyndham Dunstan, F.R.S., 
Director of the Imperial Institute, London, has rendered great assistance 
in indicating market requirements by carrying out analyses, and by 
obtaining valuations on samples submitted to him from time to time. 
The opportunity is here taken to acknowledge the help rendered 
by His Highness the Maharaja Scindia of Gwalior and his Conservator 
of Forests, Rai Bahadur Har Sarup, in allowing the Forest Economist 
to visit the State forests to see the tapping operations, and in supplying 
samples of the gum-oleo-resin. Thanks are also due to Messrs. Billson, 
Hill, Napier, Bartlett, Dunbar-Brander, Benskin, Starte, Bhadbhade 
and Patel for the assistance they gave in carrying out tapping 
experiments. 
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