清, 徐揚等, 乾隆南巡圖, 第四卷﹕黃淮交流, The Qianlong Emperor's Southern Inspection Tour, Scroll Four: The Confluence of the Huai and Yellow Rivers (Qianlong nanxun, juan si: Huang Huai jiaoliu), Qing dynasty (1644?1911), dated 1770, China, Handscroll; ink and color on silk, lacquer box, 27 1/8 x 431 1/4 in. (68. 8 x 1096. 17 cm), Paintings, Xu Yang (Chinese, active ca. 1750?after 1776) and assistants, This oversize scroll is the fourth in a set of twelve commissioned by the Qianlong Emperor to document his first tour of southern China, made in 1751. The scroll portrays Qianlong inspecting flood-control measures along the Yellow River