What is the important theory of epigraphy in the late Qing Dynasty and the Republic of China?

One of the calligraphy styles in the late Qing Dynasty was greatly influenced by Oracle Bone Inscriptions, Jinwen and Weibei. In the Qing Dynasty, many calligraphers dabbled in learning, adapted and used them for their own use, and eventually became everyone. That is to say, in the practice of calligraphy, many calligraphers integrate the brushwork of A, Jin, Zhuan, Li and Bei into the open and closed lines, or integrate several calligraphy styles into one, thus forming their own family. Masters such as Kang Youwei and Zheng Banqiao are examples. This makes the calligraphy style of Qing Dynasty, which prevailed in pavilions and pavilions, look brand-new and full of vitality, and its influence even continues to modern times.