Part III.] Puran Singh ; Note on Manufr. of N gai Camfhor. 283 
The assay was, therefore, repeated with a gentle current of steam, 
and the receiver kept cool by cold water running over it. The percentage 
yield of the essential oil found in this case was 0-361. 
It is thus evident that rapid distillation -vvill have to be avoided and 
the distillate will have to be kept cool as far as possible during the extrac- 
tion of volatile oil from B. halsamifera. 
Sample No. 5.— Leaves from Mawhan received in a mouldy condition. 
The percentage yield was 0-265. 
Sample No. 7. — Shade -dried leaves of Cinnamonum camphora from the 
Dehra Dun College Park. Assayed under the same conditions. The per. 
centage yield was found to be 1-658.^ 
Preparations op crude camphor by Chinese process. 
10 lbs, =4535‘9 grams of the leaves of the Taungoo shade-dried leaves 
(Sample No. 3) were distilled for 6 hours in an apparatus similar to that 
adopted by the Chinese for distilling Blumea halsamifera {vide 
Plate No. V). The oil was not separated in this way, but the amount 
of the raw camphor scraped from the bottom of the condensing lid on 
which it sublimed during the process of distillation was fomid to be 
23 '753 grams. It was of course very crude and was found to contain 
moisture amounting to 40 ’31 per cent. Deducting moisture the percent, 
age of dry camphor as extracted by the Chinese process comes to ‘211 
calculated on dry leaves. Taking 1 '88 as the percentage of the volatile 
oil in the leaves as determined by extraction, the dry camphor forms 
11-22 per cent, of the total oil (extractible by ether). If we take 0-423 
as the percentage of the volatile oil as determined by steam distillation, 
the yield of the camphor from the oil (extractible by steam) amounts 
to 49-88 per cent. 
The crude camphor as obtained above was of a dirty white colour. 
When freed from moisture its specific gravity was found to be 1-06 at 
25°C. (sp. gr. at 15°C. for pure 1-borneol = 1-02). 
It melted at 175 — 176°C. (m.p. for pure 1-borneol == 203 — 204°C.). 
Evidently the camphor in question was not a very pure product. Its 
odour, however, agreed with that of common camphor, while it partook 
at the same time of that of amber as pure Ngai camphor does. ■ ! 
It is to be noted that the percentage yield from the volatile oil of B. 
halsamifera of Ngai camphor as obtained above by the Chinese process 
1 Conj. Bericht von Schimmel & Co., Oct. 1892, p. 7, where a sample of the dry 
leaves of Cinnamonum camphora is reported to have yielded 1 -8 per cenl . of oil. 
