Book Reviews and Abstracts

conative; or, in less technical language, the intellectual from the temperamental and moral aspect of the mind. The detailed discussion of conation he leaves for another volume. But, from his brief references in the present work, it is clear that he considers the mental activities of man to be determined largely by two outstandinggeneral factors : besides the better-known factor of g (or " general intelligence ") underlying intellectual abilities, he recognises a second factor, called w, which has tentatively been termed self-control (though Professor Spearman thinks the name misleading), and which underlies moral and emotional activities and so affects the chief