The first Roman Catholic Church for Germans was organized in Philadelphia in 1787. Ground for a building was purchased at the northwest corner of Sixth and Spruce Streets. Articles of incorporation were granted October 4, 1788, under the title of “The Trustees of the German Religious Society of Roman Catholics, called the Church of the Holy Trinity in the City of Philadelphia.” The first medical library in the United States was established in connection with the College of Physicians in Philadelphia, in April, 1788. “The Free African Society” was founded April 12, 1788, by Absalom Jones and Richard Allen, two negro clergymen of Philadelphia. The “African Church,” the first church in America exclusively for and controlled entirely by negroes, was built by this Society, and opened for public worship July 17, 1794. It was incorporated March 28, 1796, as “The Minister, Church Wardens and Vestrymen of the African Episcopal Church of St. Thomas, in the City of Philadelphia.” In 1789, Lucian’s “Dialogues,” first Greek book printed in America, was by Joseph James at Philadelphia. The Philadelphia Stock Exchange, the first in America, originated in 1790, in a building at the southwest corner of Front and Market Streets, known as the “London Coffee House.” It was known as the “Philadelphia Board of Brokers” until the 8th of December, 1875, when it was changed to its present name, “The Philadelphia Stock Exchange.” The first law school in America was opened by the University of Pennsylvania, December 15, 1790, President Washington and the members of his cabinet taking part in the exercises. Turkish and Axminster carpets were first made in this country in 1791, by William Peter Sprague, in the Northern Liberties. First Bank of the United States, was established in Philadelphia, February 25, 1791. The first patents for machines for threshing grain in the world were awarded to Samuel Mulliken, of Philadelphia, March 11, 1791. In 1791, Charles Willson Peale established a drawing school, which was succeeded in 1794 by “The Columbianum,” also established by Charles Willson Peale. This was the first society in the United States for the promotion of the fine arts. The first canal in the United States was the “Schuylkill and Susquehanna Navigation Company,” chartered here in 1791. There were 2000 shares of stock at two hundred dollars per share, and the officers were Robert Morris, president; Timothy Matlack, secretary; and Tench Francis, treasurer. The first United States Mint was built in Philadelphia, at what is now 37 and 39 North Seventh Street. The corner stone was laid July 31, 1792, and the first coins, consisting of dimes, half-dimes and cents, were struck in October of the same year. David Rittenhouse, a Philadelphian, was the first director.