He turned his attention to secret medicine (herbal medicine) in the Kaga Domain, that had been nurtured in as a long Japanese tradition, and studied the components of herbal medicine in a scientific manner.
日本の長い伝統に育まれて来た加賀藩の秘薬（漢方薬）に目を向け、漢薬の成分の科学研究を行う。