50 LIBRARY USERS by economic status, more than either the upper or the lower classes. Single persons patronize it more than married ones, and whites more than Negroes. Use of the reference services of the public library is both more limited and more specialized than use of the circulation services. Apparently most of the reference patrons are men, the better-educated, professional people, and students. Two groups who make much use of the circulation department— housewives and white-collar people—make relatively little use of the reference department. The degree of overlapping between the reference and the circulation clienteles of the public library is not known. Library use is not uniform throughout the country. It varies inversely with the size of the city, down to the 25,000 popu- lation level, and directly with accessibility. It tends to be greater in the city than in the country, and it also varies by regions. The most significant factor in the use of libraries by adults is education. Other factors are constantly affected by this pervasive one. The library, as part of the educational system, would seem, from the indirect and fragmentary evidence we have, to serve opinion and community leadership in a posi- tive way. It is possible, therefore, although certainly not proven, that the minority using the public library may have a proportionately large influence in the community.