The sap of certain tropical trees hardens into rubber. This is one of the most valuable of tree crops, for there is hardly a household that does not have rubber articles of a dozen kinds that are daily used. Lacquer varnish is the juice of certain sumach trees that grow in Japan. Gums of fir trees have a special use in medicine, and in various arts.
Sweet gum oozes from trees of that name. This is not noticeable in our trees of the North, but if we follow the trees southward, the gum flow increases. In Mexico it is an article of commerce, obtained by wounding the bark of the trees. It is one of the staple glove perfumes in France. It is also made into medicines, perfumes, and incense.
The sap of wild cherry, holly, and buckthorn, of witch hazel and sassafras all yield medicinal drugs. The flowers of locust, of basswood, and all the fruit trees furnish nectar out of which bees make honey. The juicy inner bark of the slippery elm is valuable for food, and as a medicine.
THE USES OF TREES
Imagine a stranger who has lived all his life in a desert where no trees grow, coming suddenly into our village, and looking with wonder at the trees that shade the streets. He knows only the spiny cactuses, and other plants of the desert. His first question would be, “What are these great plants that stand so tall?” The name, tree, is new to him. It would be a strange experience to take such an eager and ignorant man and show him the trees, on the streets, planted in orchards, and growing wild in the woods outside of the town. His questions set us to thinking. He wants to know why we plant trees, and how we use those that grow in forests.
First, we tell him the uses of the living trees. Up and down the streets they are set for shade, and for their beauty. Rows of evergreens set close together make a protecting wall of green against the cold winds. Low clipped hedges of many kinds of trees make living boundaries, much more beautiful than wooden or wire fences. On lawns and near houses trees are planted for their beauty and for their shade. Orchards of fruit trees are planted because they furnish food. Nut orchards are set out for the same reasons.
The trees cut down in the woods, and sawed at the mills give us lumber to build houses to live in, and furniture to make them comfortable, and the same forest furnishes the fuel that keeps us warm. There is so much to explain to a person who discovers trees for the first time. It takes a long time to tell all we know.
Do we think that we know a great deal about the uses of trees? If so, we are mistaken. The truth is that trees serve us in ways of which we have never dreamed.
We must travel over the world and read a great deal to learn how the people of other countries make use of trees. The basswood or linden which nobody cared to use except for fuel in the Middle West might pass for a useless tree, compared with those whose wood is harder and stronger. But in older countries people have quite a different opinion of the tree.
In Russia the tough bark of young lindens is used to make the shoes of peasants. Ropes, fishing nets, and braided mats are made from the same tough “bast” fibres, which are very long and tough in this family of trees. The seeds yield oil that is declared to be quite as good as olive oil for cooking, and for the table. Perfume is distilled from the flowers. Cattle browse on the twigs and leaves. The wood is the carver’s delight—soft, white, free from knots and imperfections. It is used for bureau drawers, carriage bodies, shoe soles, barrel staves and paper pulp. Its twigs make artist’s charcoal pencils.