Principles of Painting. A mid-18th-century five-volume treatise on painting by Sakurai Sekkan 桜井雪館 (1715-90). An ally of the Unkoku school *Unkoku-ha 雲谷派, and self-proclaimed twelfth generation of descendant of the painter Sesshū Tōyō 雪舟等楊 (1420-1506), Sekkan sets forth a description and defense of Sesshū's painting style. In addition to describing Sesshū's style and its basis in Chinese painting, Sekkan sets the current practice of the Sesshū style in relation to the "inferior" qualities of competing styles, including the Southern school *nanga 南画 and Nagasaki school *Nagasaki-ha 長崎派 styles. Gasoku was recorded by Sekkan's second daughter Seppo 雪保 (1753-1824) in 1772, but not published until 1777. Of the five volumes, the first concerns art theory, while the other four provide illustrations. It is published in Sakazaki Tan 坂崎坦, ed., Nihon garon taikan 日本画論大観 1 81-96.