[Dan.] The exterior covering of the trunk and branches of exogenous trees, the endogens and the ferns having no true bark. Some barks are very thin and others thick ; those of the giant trees of California are two feet thick. The outer bark protects an inner bark. In many trees the outer bark is coarse, and has no life in it. The inner bark is fresh and full of sap. The sap which goes up through the wood of the tree from the roots to the branches comes down through the inner bark. Bark is useful for dyeing and tanning leather, and certain kinds* are made into corks. Quinine is made from Peruvian bark. (See Cinnamon, Cork, Exogen.)