40 PHILIPPINE RESINS, GUMS, AND OILS 



30 

 and obtained the following results: Specific gravity — ^=0.9202. 



oU 



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 

 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 (Bl.) A.Gray. (Figs. 11, 12). PiLI. 



Local names: Alangki (Union) ; dnteng (Cagayan, Abra, Isabela) ; 6a- 



koog (Ilocos Sur) ; buldu (Pangasinan) ; maiapili (Camarines) ; pagsai- 



