The promotion of Mr. Knox to the office in which he was able to do himself the most credit, and perform those services to the country which are part and parcel of its financial progress, occurred in 1867. At this time a vacancy was brought about in the Deputy-Comptrollership of the Currency, and Secretary McCulloch appointed him to fill it. Until May 1, 1884, he remained as Deputy or head of the Bureau, his terms of office being as follows: Five years as Deputy-Comptroller, from 1867 to 1872; five years as Comptroller, from 1872 to 1877, appointed by General Grant; five years, second term as Comptroller, from 1877 to 1882, by President Hayes, on the recommendation of Secretary Sherman—the reappointment being made without his knowledge, before the expiration of the preceding term, and confirmed by the Senate without reference to any committee. He was again reappointed, by President Arthur, April 12, 1882. In 1870 he made an elaborate report to Congress (Senate Mis. Doc., No. 132, XLI. Cong., 2d Sess.), including a codification of the Mint and Coinage laws, with important amendments, which was highly commended. The bill which accompanied the report comprised, within the compass of twelve pages of the Revised Statutes, every important provision contained in more than sixty different enactments upon the Mint and Coinage of the United States—the result of eighty years of legislation. This bill, with slight amendments, was subsequently passed, and is known as “The Coinage Act of 1873;” and the Senate Finance Committee, in recognition of his services, by an amendment, made the Comptroller of the Currency an _ex-officio_ member of the Assay Commission, which meets annually at the Mint in Philadelphia for the purpose of testing the weight and fineness of the coinage of the year. Through his official reports, twelve in number, and his addresses on the currency question, Mr. Knox has indirectly exercised great influence in financial legislation, and he took an active, though quiet and unassuming part, in the great financial _coup d’etat_ of the resumption of specie payment.