Text ( visual ) : unmediated The nature of 'intelligence' and the principles of cognition / by C. Spearman. -- London : Macmillan , 1923. -- viii, 358 p. : ill. ; 22 cm. -- Includes index. -- (BA16808952) ; https://ci.nii.ac.jp/ncid/BA16808952 Author Heading(s): Spearman, Charles Edward. -- Subject Heading(s): FREE : Psychology