Question: The son of Johann Georg Mozart wrote what violin textbook?
Context: Johann Georg Leopold Mozart (November 14, 1719 – May 28, 1787) was a German composer, conductor, teacher, and violinist.  Mozart is best known today as the father and teacher of Wolfgang Amadeus Mozart, and for his violin textbook "Versuch einer gründlichen Violinschule". Johann Georg Beck or Johann Georg Baek (24 April 1676 in Augsburg – 7 August 1722 in Braunschweig) was a German engraver.  He taught fellow-Augsburger Johann Georg Schmidt, who married his widow Anna Elisabeth and took over the family studio.  Johann's son Anton August Beck trained in this studio and inherited it on Johann's death. Johann Georg Mozart (4 May 1679 – 19 February 1736) was a bookbinder who lived in Augsburg, Germany, in the 17th and 18th centuries.  He was the father of Leopold Mozart and the grandfather of Wolfgang Amadeus Mozart. Anton August Beck (27 August 1713, Braunschweig - 17 March 1787, Braunschweig) was a German engraver.  He was the son of Johann Georg Beck and his wife Anna Elisabeth.  On Johann's death, his student Johann Georg Schmidt married his widow and adopted his business.  On Schmidt's death, Anton took over the business. Johann Georg, Chevalier de Saxe (21 August 1704 – 25 February 1774), also called "Johann Georg of Saxony", was a Saxon Field Marshal and Governor of Dresden. Count Johann Georg von Browne (or Johann Georg von Browne-Camus; 20 September 1767 – January 1827) was an officer in the Russian army, and settled in Vienna where he was a patron of Ludwig van Beethoven during the composer's early career. Prince "Johann Georg" Pius Karl Leopold Maria Januarius Anacletus of Saxony, Duke of Saxony (Full German name: "Prinz Johann Georg Pius Karl Leopold Maria Januarius Anacletus von Sachsen, Herzog zu Sachsen") (born 10 July 1869 in Dresden, Saxony; died 24 November 1938 at Schloss Altshausen in Altshausen, Baden-Württemberg, Germany) was the sixth child and second-eldest son of George of Saxony and his wife Maria Anna of Portugal and a younger brother of the Kingdom of Saxony's last king, Frederick Augustus III of Saxony.  Johann Georg was a well-known arts expert and an avid art collector. Johann Georg, Prince von Hohenzollern ("Johann Georg Carl Leopold Eitel-Friedrich Meinrad Maria Hubertus Michael"; 31 July 1932 – 2 March 2016) was a German prince, and through his marriage to Princess Birgitta of Sweden, was brother-in-law of King Carl XVI Gustaf of Sweden. The Adagio in E for Violin and Orchestra, K. 261, was composed by Wolfgang Amadeus Mozart in 1776.  It was probably a replacement movement for the original slow movement of his Violin Concerto No. 5 in A.  It is believed that Mozart wrote it specifically for the violinist Antonio Brunetti, who complained that the original slow movement was "too artificial."  The work is scored for solo violin, two flutes, two horns and strings. Johann Georg Schrepfer, or Johann Georg Schröpfer (1738?  – 8 October 1774 in Leipzig) was a German charlatan, independent Freemason, and necromancer.  He performed ghost-raising séances for which he secretly used special effects, possibly including magic lantern projections of ghosts on smoke, which inspired the phantasmagoria shows popular in Europe from the 1790s to the 1830s.
Answer: Versuch einer gründlichen Violinschule