Act of Mar. 3, 1879, sec. 2 (as amended)

Sec. 2. That the Secretary of the Treasury of the United States is hereby directed to hold said sum in trust for the purpose aforesaid; and it shall be his duty, upon the passage of this act, to invest said sum in United States interest-bearing bonds, bearing interest at four per centum, of the issue of July, eighteen hundred and seventy, and upon their maturity to reinvest their proceeds in other United States interest-bearing bonds, and so on forever.