THE progress of science in the past century has reduced the world to the unity of interdependence. A civil war in America brings starvation to the cotton towns of Lancashire. An injury to the credit-structure of Germany may involve a panic on the Paris Bourse. Not less notable than this web of complex interweaving is the pace at which change proceeds. Feudal Japan can become, as it were overnight, the modern state. Men are still living to whom the railway was an incredible innovation; and their children will doubtless watch aerial traffic blot out the distance between London and New York.
We pay, of course, the price for scientific development. The complexity that ensues involves a necessary fragility in the machine. The working of our social institutions depends, as never before, upon the maintenance of peace. The mechanisms of civilization are so delicate that they respond like the needle
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