88 PHILIPPINE RESINS, GUMS, AND OILS 
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and obtained the following results: Specific gravity 0.9202. 
Optical rotation —31° .3 (10 centimeters, 30°). When cooled 
below 20°, white crystals of a hydrocarbon were obtained. This 
hydrocarbon is present to the extent of a few per cent. The oil 
is soluble in ordinary organic solvents except alcohol. When ex- 
posed to the air it absorbs oxygen slowly and finally hardens. 
When steam-distilled, a colorless oil is obtained. The absence 
of alcoholic substances was proved by the fact that the oil is not 
acted upon by sodium or phosphorous pentoxide in benzol. When 
an acetic acid solution of the steam distillate was treated with 
hydrochloric acid gas, cadinene hydrochloride was obtained. The 
oil is therefore probably a mixture of sesquiterpenes. The non- 
volatile portion of the oil which remains after distillation was 
recrystallized from alcohol. Its saponification number was found 
to be 64, which shows that the saponifiable matter is negligible. 
Sindora supa is a tree reaching a height of 20 to 30 meters 
and, in exceptional cases, a diameter of 150 to 180 centimeters. 
The bole is straight, regular and without buttresses. The bark 
is 7 to 10 millimeters thick, brown to nearly black in color, and 
sheds in large scales. When the bark is freshly shed it exposes 
pink-colored patches. The leaves are alternate and simply com- 
pound, usually with three pairs of leaflets. These are smooth, 
leathery in texture, from 3.5 to 9 centimeters long, and from 
2.5 to 5 centimeters wide. The fruit is a pod covered with 
straight, stiff spines on the ends of which drops of sticky oil 
accumulate. 
The wood is hard and heavy. The heartwood is yellow or 
pinkish when fresh, gradually turning to a dark-bronze color 
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with age. This wood was used formerly in general construction ‘ 
for beams, joists, rafters, etc., and in bridge, wharf, and ship 
building. It is now too highly prized for interior finish, fur- 
niture, and cabinet work, and especially flooring, to be put to 
the former uses. It is an excellent wood for fine turned and 
shaped tool handles, rulers and other desk supplies. 
This species is intolerant of shade, occurs on limestone ridges, 
and appears to be confined to a limited portion of those regions 
without a distinct dry season. 
Family BURSERACEAE 
Genus CANARIUM 
CANARIUM LUZONICUM (BI1.) A. Gray. (Figs. 11, 12). Pits 
Local names: Alangki (Union); adnteng (Cagayan, Abra, Isabela); ba- 
kéog (Ilocos Sur); buldu (Pangasinan); malapili (Camarines); pagsat- 
