Abstract
This article brings together some estimates of labor inputs in capital formation in American agriculture, compares the various forms of capital as uses of farm labor, and relates the labor input to the size of the labor force in agriculture in the period 1850–1910. Two major items of farm-formed capital—land clearing and farm construction—have been discussed in earlier articles. The present article adds to these estimates the material on the lesser forms of farm capital—fencing, drainage, and irrigation—and discusses the significance of the totals arrived at.

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