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pp. 245, “The Measure of Reality is the third book in a series in which Alfred Crosby, a noted historian, asks how it is that Western European societies could have conquered so much of the world in the space of a few generations. The answer, he finds, is in certain agricultural and technological techniques. In this volume he turns to one set of techniques in particular: the precise measurement of time, number, and distance. That precise measurement enabled European armies to march in step, enabled navigators to find faraway ports, and enabled gunsmiths and chemists to formulate the weapons of conquest. These inventions were refined over centuries, but most came heavily into play in the years between 1250 and 1300, the period Crosby examines in closest detail.”