There shall be prepared by the Department of Agriculture an annual report on the work and expenditures of the agricultural experiment stations established under the Act of Congress of March second, eighteen hundred and eighty-seven [7
et seq.], on the work and expenditures of the Department of Agriculture in connection therewith, and on the cooperative agricultural extension work and expenditures of the Department of Agriculture and of agricultural colleges under the Act of May eighth, nineteen hundred and fourteen [7
et seq.], and there shall be printed annually eight thousand copies of said report, of which one thousand copies shall be for the use of the Senate, two thousand copies for the use of the House of Representatives, and five thousand copies for the use of the Department of Agriculture.