After numerous business ventures, he became an authority concerning double-entry bookkeeping and published a textbook concerning the subject, which had 45 editions and remained in continuous publication until 13 years after his death.
無数の冒険的事業ののち、彼は複式簿記の権威となり、その教科書を刊行し、これは45版を重ね、死後13年間刊行が続いた。