Cai Yuanpei
In 1919, Hu Shih published the first volume of "An Outline History of Chinese Philosophy"; the later portion was never finished. Later scholars of Chinese intellectual history including Feng Youlan and Yu Yingshi agree that Hu's work was revolutionary. Cai Yuanpei, president of Peking University where Hu was teaching at the time, wrote the preface for "Outline" and pointed out four key features that make Hu's work distinct: