(Randel 1996), p. 743. What a title. Here is an attempt at a translation: "Harmonic instructions or systematic directives concerning musical art and the rules of composition." The treatise was published and translated into French (Traité d'harmonie et de composition, Paris 1804) by Christian Kalkbrenner. According to Édouard Sitzmann however the best of Richter's treatise was left out of the translation (Sitzmann's 1910 biographical dictionary online, p. 572).