GREENHEART, one of the most valuable of timbers, the produce of Nsctandra Rodiaei, family Lauraceae, a large tree, native of tropical South America and the West Indies. From its bark and fruits is obtained the febrifuge principle bibirine. Green heart wood is of a dark-green colour, sap wood and heart wood being only distinguished with difficulty. The heart wood is one of the most durable of all timbers, and its value is greatly enhanced by the fact that it is proof against the ravages of many marine borers which rapidly destroy piles and other submarine structures of most other kinds of wood available for such purposes. Green heart is one of the strongest of all woods, and is exceedingly dense, its specific gravity being about 115o. It is extensively used for keelsons, beams, engine-bearers and planking, etc., but its exces sive weight unfits it for many purposes for which its other prop erties would render it eminently suitable.