标题:803 精神薄弱児の行動発達と教育に関する研究 (I) (日本教育心理学会第4回総会部門別研究発表要旨・討論の概要 : 19. 精神薄弱・境界線児 (1)) [in Japanese] 803. A study on the behavior developments and education of the feeble-minded (I). (TITLE OF PAPERS AND THE SUMMARIES OF DISCUSSIONS : 19. Mental deficiency (1)) [in Japanese]