Gregory family: notes, lectures and essays: William Logan: A dissertation on the duties of man deduced from observations on his natural condition in which his several organs faculties & powers are peculiarly considered with regard to their application 'A dissertation on the duties of man deduced from observations on his natural condition in which his several organs faculties & powers are peculiarly considered with regard to their application'. By William Logan, Junior Student of Medicine in the University of Edinburgh, President of the Physico-Medical society, Member of the American and Philadelphian Philosophical Societies and corresponding member of the Society of Arts in London, c 1815 - c 1820. The dissertation is unfinished. The title on the spine reads 'Logan on the passions.' c 1815 - c 1820