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    Peat is a kind of "unfinished" coal which gives off even less heat in burning than brown coal. It is brown, very soft, and so moist that it must be dried before it is good to burn. Yet, because it is found at the top of the ground and is easily cut, it is much used for heating houses in some parts of Europe. It is a poor man's fuel.
    What we call jet is really a very hard kind of coal. It is used for making buttons, beads, and other ornaments, and not for fuel.
    There are many different kinds of both hard and soft coal. Hard coal, soft coal, brown coal, and cannel coal, however, are the main kinds for you to remember. Hard coal and soft coal are far more important than the other kinds.

The Uses of Coal
    What is coal good for? "To keep the house warm in winter," you may say. "To cook the meals, too," perhaps you add.
    True, much coal is used in homes for heating and cooking. Yet more than three times as much coal is used in other ways. What does that matter to you? A great deal.
    Do you go about town by electric streetcar? Probably the electric current comes from a coal-burning steam power plant.
    On your breakfast table may be oranges from Florida or California, butter from Wisconsin, and bread made of wheat grown in Kansas or Nebraska. How did they reach you? They were probably brought on freight trains pulled by coal-burning locomotives.
    Your clothes are made of cloth woven, probably, on looms driven by steam-- and the steam is made with coal fires.
    In fact, if you knew the story of the things that you use and see daily, you would find that most of them had been either made or brought to you, or both, by the aid of coal. In our modern world machines are our servants and coal is the "food" which most of our machine servants must have in order to work.
    Many great cities are near great coal fields. It is not hard to understand why. The coal is one reason the cities are great. They have grown great partly by manufacturing. Manufacturing has grown great there partly because of the cheap fuel, coal, that can be had near by.