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Nor since the day of the caveman has man's efficiency for food-getting and shelter-getting diminished. It has increased a thousand fold. Since the day of the caveman, matter has been mastered. The secrets of matter have been discovered. Its laws have been formulated. Wonderful artifices have been made, and marvellous inventions, all tending to increase tremendously man's natural efficiency of I in every food-getting, shelter-getting exertion, in farming, mining, manufacturing, transportation, and communication.

From the caveman to the hand-workers of three generations ago, the increase in efficiency for food and shelter-getting has been very great. But in this day, by machinery, the efficiency of the hand-worker of three generations ago has in turn been increased many times. Formerly it required 200 hours of human labor to place 100 tons of ore on a railroad car. To-day, aided by machinery, but two hours of human labor is required to do the same task. The United States Bureau of Labor is responsible for the following table, showing the comparatively recent increase in man's food- and shelter-getting efficiency: