"Bankoku Koho" was the title of Chinese translation of "Elements of International Law," which was the representative work of Henry Wheaton, who was a jurist specialized in international law.
「万国公法」とは、国際法学者であるヘンリー・ホイートンの代表的な著作ElementsofInternationalLawが漢語訳されたときのタイトル名。