Section 641, acts July 17, 1916, ch. 245, title I, 1, 39 Stat. 360; Mar. 4, 1923, ch. 252, title I, 1, 2, 42 Stat. 1454; Ex. Ord. No. 6084, Mar. 27, 1933, directed that act July 17, 1916, be administered by the Farm Credit Administration. Section 642, act July 17, 1916, ch. 245, title I, 2, 39 Stat. 360; Ex. Ord. No. 6084, Mar. 27, 1933, defined terms first mortgage and farm-loan bonds.