Calambuco, a valuable timber tree, found only in the northern provinces of the island of Luzon. For ship building it is esteemed superior to live oak or teak. It resembles the latter when dressed, has the same dark unctuous appearance, and like it is never attacked by the destructive white ant of the Malay archipelago. Vessels built of it are said to be seaworthy for 50 years. A great variety of agricultural, mechanical, and warlike instruments are made from this wood. - This name is also given to a tree which produces the odoriferous agila or eagle wood and aloes wood of commerce. It is found chiefly in Siam, the Malay peninsula, and in the northern portion of Sumatra; but it is also found in the Indian peninsula, where it is called agharu, and hence it is sometimes named by the Malays kayugharu. The perfumed wood is supposed to be a diseased tumor in the tree, arising from the wound of a timber worm. The thickened, resinous sap formed in these tumors is used as an incense in all eastern countries. There is much discrepancy in the statements relative to the tree yielding the genuine agila, and this perfume and aloes wood have been supposed to be the products of different trees; but it is the heart of the kayukalarribak, or calambuco tree, which produces the aloes wood, and in the bark the agila is formed.

The agila does not yield its aroma until burned; but the calambuco or aloes diffuses its fragrance when rubbed in the hands.