Gruber, Howard E. DARWIN ON MAN. A Psychological Study of Scientific Creativity by Howard E. Gruber. Together with Darwin's Early and Unpublished Notebooks Transcribed and Annotated by Paul H. Barrett. Foreword by Jean Piaget. Med. 8vo, First U.K. Edition; pp. [ii], xxviii, 498(last 3 blank); 35 illustrations (photographs, drawings & diagrams), chronology, appendices, index; original papered boards; a very good copy in dustwrapper. London; Wildwood House; (1974).