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164 In addition to the multiple-function, farm-grown crops used for food, fuel and building material, there is a large acreage devoted to the growing of textile and fiber products and enormous quantities of these are produced annually. In Japan, where some fifty millions of people are chiefly fed on the produce of little more than 21,000 square miles of cultivated land, there was grown in 1906 more than 75,500,000 pounds of cotton, hemp, flax and China grass textile stock, occupying 76,700 acres of the cultivated land. On 141,000 other acres there grew 115,000,000 pounds of paper mulberry and Mitsumata, materials used in the manufacture of paper. From still another 14,000 acres were taken 92,000,000 pounds of matting stuff, while more than 957,000 acres were occupied by mulberry trees for the feeding of silkworms, yielding to Japan 22,389,798 pounds of silk. Here are more than 300,000,000 pounds of fiber and textile stuff taken from 1860 square miles of the cultivated land, cutting down the food producing area to

Fig. 91.—Earth and clay brick kiln on the bank of the Pei ho, using sorghum stems for fuel.