Excerpts: The use of equipment and mechanical power on farms in the United States has tremendously increased efficiency in the use of farm labor. The saving in time on farm work resulting from the use of tractors, tractor equipment, motortrucks, and electrical devices has reduced the need for workers particularly in some lines of production and in some areas. Not all of this change can be attributed to mechanization as we know it today. The shifting of producing areas into the prairie sections, and the use of large scale horse-drawn equipment was effective in reducing labor before tractors came into use. So long as the agricultural industry was expanding the numbers employed were not particularly affected by labor-saving devices, but when the industry ceased to expand, excess farm population became more serious. Agriculture in 1939 probably employed 500,000 fewer people than in 1930 and the end is not yet. The use of known techniques will release many more workers and we have no reason to expect that technical improvement will not continue. The following exhibits show the influence of mechanization on the labor on farms and provide a basis for anticipating further changes.