“For after all, if the lives of most men are examined in detail, it will be found that they have been experts of immense stature in some unremunerated field, the strategy and theory of some sport or the practice of some craft, have had an exhaustive knowledge of old circus posters or eighteenth-century inn signs or the mathematics of comets; and nothing so distinguished Professor Peacock from the ruck of men as his air of amateurishness.”