£6 
Indian Forest Records. 
[Vol. IV. 
by the addition of small quantities of fresh spirit. The following 
table shows how uniform was the quality of the oil obtained: — 
No. of 
hargc. 
Time of 
distillation. 
Specific 
gravity by 
hydrometer. 
Fractions taken at Bhowali. 
1 
3£ hours . 
•859—-860 
155°—160°C. .... 
69% 
160°—165°C .... 
26% 
Residue above 165°C. 
5% 
2 
4 hours 
•859—-860 
155°—160° C. 
66% 
160°—165°C. 
30% 
Residue above 165°C. 
4% 
3 
54 hours 
•859—-860 
155°—160° C. 
77’5% 
160°—165° C. 
20% 
Residue above 165° C. . 
2*5% 
The oil thus distilled was labelled A. 
Attempts were made to reduce the duration of distillation, by 
dropping spirit from above in a thin stream, as done in the case of 
water in w T ater distillation, after the still has been heated to about 
120° C. by the fire below. The time taken was about 1^ hours from 
when the destination started and about 2 hours in all, about 1^ hours 
less than the time necessary for one charge in water distillation. 
The oil thus rapidly distilled gave on fractional distillation the 
following fractions: — 
155°—160° C. ..38 per cent. 
160°—16; °C.48 
Above 165° C. . . . .... 14 „ 
Its specific gravity by hydrometer was '864—'865. 
This shows that oil even when rapidly distilled w T ith 70 per cent, 
methylated spirit instead of water is in every way better than the Z 
quality, which is by no means unsaleable. The rapidly distilled oil 
was labelled B. 
As said above it is possible to improve this quality still further 
by “ cutting ” the still when 90 per cent, of the oil has come over. 
[ 26 J 
