The "Kenken Roku" (literally, record of kenken - "kenken" refers to one-legged jumping) which he began writing in 1892 described how he handled the Sino-Japanese War and the Triple Intervention; since it cited confidential documents of the Ministry of Foreign Affairs, it had been kept closed to the public for a long time, and was published for the first time in 1929.
1892年から執筆を開始した「蹇々録（けんけんろく）」は、日清戦争、三国干渉の処理について記述したもので、外務省の機密文書を引用しているため長く非公開とされ、1929年に初めて公刊された。