A CONCEPT denotes when, if it occurs in a proposition, the proposition is not about the concept, but about a term connected in a certain peculiar way with the concept. Some people often assert that man is mortal, and yet we never see announced in The Times that Man died on a certain day at his villa residence " Camelot " at Upper Tooting,1 nor do we hear that Procrastination was again the butt of Mr. Plowden's jokes at Marylebone Police Court last week.