Chinese scholars, court academies, and local officials carried on late Ming dynasty strengths in astronomy, mathematics, and geography, as well as technologies in ceramics, metallurgy, water transport, printing. Contrary to stereotypes in some Western writing, 16th and 17th century Qing dynasty officials and literati eagerly explored the technology and science introduced by Jesuit missionaries. Manchu leaders employed Jesuits to use cannon and gunpowder to great effect in the conquest of China, and the court sponsored their research in astronomy. The aim of these efforts, however, was to reform and improve inherited science and technology, not to replace it.