In 1888, after he published 'Dainihon Fudosan Enkakushi' ('大日本不動産沿革史') (History of estates in Japan), which he had written as his thesis for the Department of Law, he became a teacher at Tokyo koto shogyo gakko (Tokyo Higher Commercial School) at the request of Jiro YANO, who was the principal of the school and had been impressed by the book, and he was assigned to the research organization of the same school, 'Naikoku Shogyo Torishirabe Gakari' (research organization of domestic commerce), and became an assistant professor two years later.
法学科卒業論文として書いた「大日本不動産沿革史」を明治21年（1888年）に公刊したところ、同書を読んで感銘を受けた矢野二郎の要望で彼が校長を務める東京高等商業学校の教員となり、同校の研究組織であった「内国商業取調掛」に任命され、2年後に同校の助教授となった。