Thomas Boston Johnstone, Dictionary of National Biography (1901)
“ In 1868 he was appointed to the chair of moral philosophy in the university of Edinburgh. His systematic teaching was on the lines of the Scottish philosophy and against all Hegelian tendencies, and he showed how philosophical studies could be pursued in a devout spirit. At an early period in his work as a professor the newer evolutionary science then rising into prominence engaged his attention, and he tried to discover and explain the bearings of physiological science on man's mental and moral nature. ”
