Section 51, R.S. 1674; act Feb. 5, 1915, ch. 23, 6, 38 Stat. 806, related to official designations in consular service. Section 51a, R.S. 1695; acts Apr. 5, 1906, ch. 1366, 3, 34 Stat. 100; Feb. 5, 1915, ch. 23, 6, 38 Stat. 806, related to appointment of vice-consuls and consular agents.