x, 416pp, a few black and white graphs and diagrams. Red cloth-covered boards, gilt titles on spine. 8vo. Very light wear to boards. Extremities lightly rubbed, corners lightly rounded. Text block edges tanned and lightly foxed. Rear pastedown has some small stains. Lender's markings on front endpapers, rear free endpaper and copyright page. Otherwise, internally neat, clean and tight.
On the transformation in the conception of intelligence and its roots.
