With his nephews as willing companions and eager listeners, Uncle Paul continued his walks and talks in the pleasant summer afternoons. “Bread is made of flour,” he began, “and flour is wheat reduced to powder under the millstone. What an interesting mechanism that is, the flour-mill, driven by water, by the wind, sometimes by steam! What wearisome effort, what waste of time, if we had not this invention and were forced to do its work of grinding by sheer strength of arm!…
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