196
The Utilization of Waste.
tons of potassium, and 1,158,000 tons of nitrogen comprised in a gross weight exceeding 182 million tons, gathered from every home, from the country villages and from the great cities like Hankow-Wuchang-Hanyang with its 1,770,000 people swarming on a land area delimited by a radius of four miles.
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Fig. 107.—Map of country surrounding Shanghai, China, showing a few of the many canals on which the waste of the city is conveyed by boat to the farms.
Man is the most extravagant accelerator of waste the
world has ever endured. His withering blight has fallen
upon every living thing within his reach, himself not
