Sociologists, of course, know a large number of facts about their society—how many Negroes there are, how many people belong to voluntary associations, how many persons have advanced into high-ranking jobs, and other facts reported in A Sociological Almanac for the United States and similar publications. But, apart from such facts, are there in the body of sociological knowledge any laws (or law-like propositions) that can be called confirmed or trustworthy?