Because of the relation with Ito previously noted, the copy right of the "Kenpo Gikai" (Commentaries on the Constitution), a official commentary on the Constitution of the Empire of Japan and the Imperial House Law was donated by the author Ito to the Kokkagakkai in 1889, and it was published by Kokkagakkai in the same year, becoming a basic fund.
先述の伊藤との関係により、1889年には帝国憲法・皇室典範の公式解説書たる『憲法義解』の版権が著者の伊藤から学会に寄贈され、同年に学会から公刊され基本財産となった。