Paragraph 36. Perhaps the most popular of all shade trees is the elm. This is true because of its size and the great beauty and grace of its branches. It is a very hardy tree and rather rapidly growing. Elm warps very badly and splits readily, but is one of the hardest and toughest woods when thoroughly dried. It is only moderately durable when exposed to weather conditions. It is capable of taking a high polish when completely dry. It is used principally in the construction of agricultural implements, boats, shipbuilding and also for the construction of cars and wagons. Because it bends so readily and is tough it is an excellent wood for the use of coopers. It is also used in the construction of cheap furniture. Sometimes elm is mistaken for oak, however there is little excuse for such an error, for the color and grain of the wood can be easily recognized if a little care is exercised. There are a number of different kinds of elms; their general characteristics are similar.