Indian Forest Records. 
280 
[VoL. I. 
concerned. But it should be noted here that the yield is considerably 
decreased by exposure of the leaves to the sun. 
The difference in the percentages of the essentia] oil (calculated on 
dry material) from the Mawhan fresh and shade-dried samples is rather 
more marked than in the case of the Taungoo samples. The loss in the 
case of the former is of course accounted for by some of the oil having 
deteriorated by contact with the decomposition products of the rotten 
material in the leaves. 
Samples Nos. 5 and 6. — B. halsamifera being merely a small 
shrubby composite, it can of course bear no comparison with the gigantie 
forest tree, Cinnamonum camphora, the wood of which yields the common 
Japan and Formosan camphor in such large quantities that the manu- 
facturer does not care to utilise the branches and the leaves which recent 
investigation (Hooper, Pharm. Journ., Jan. 11th, 1896, 56, p, 21) 
has shown to be fairly rich in camphor and camphor oil. But it was 
thought necessary, or at least greatly desirable, to assay for comparison 
the leaves and branches of Cinnamonum camphora for the essential oil 
contained in them. The yield of the oil from other parts of this tree 
need not have been compared with the yield from B. balsamifera for the 
reason already indicated, viz., the amount of the oil from the wood of the 
former is always far more than can be obtained from the latter. 
Accordingly, I secured, through the courtesy of Mr. Beadon Bryant, 
Chief Conservator of Forests, Burma, a fresh green branch of C. camphora 
growing in the compound of his office at Maymyo. The tree from which 
it was cut was a young one. It, together with the leaves, was analysed 
at Mandalay two days after it was cut at Maymyo. The other sample, 
taken from an old tree growing in the park of the Imperial Forest College 
at Dehra Dun, was assayed after it was thoroughly dried in the shade. 
Table No. V. 
Sample. 
Part of the tree. 
.Moisture. 
Volatile 
oil. 
Volatile oil 
calculated on 
dry material. 
C. fdmphord grown in Maymyo, 
f Leaves . 
37-15 
2-61 
4-15 
No. 5, Fresh green. 
1 Branch stem 
Ugirth .3"). 
25-61 
1 -45 
1-94 
C. camphora grown in Dehra Dun 
f Leave.s . 
"1 Branch stem 
(_(girth 9"). 
6-61 
4*12 
4-41 
College Park, No. 6, Shade 
dried. 
27*38 
2-11 
2-91 
