60 WHY P EOPLEE USE THE LIBRARWS The relative turnover of fiction and nonfiction calculated in one study® supports this assumption. Over the period of a year, the average fiction book in a group of libraries circu- lated about 7.7 times, as compared with an average of only 2.2 for the nonfiction books. In another case, involving a quite different kind of community, the holdings were about 40 per- cent fiction, but the circulation was 69 percent fiction.*” On the other hand, correlations based upon circulation and hold- ings in selected branch libraries in Chicago and St. Louis** by seven categories of books revealed coefficients of more than .95 for several years. Although such coefficients do establish an extremely close relationship between circulation and hold- ings, they do not necessarily establish the reason for it. Per- haps circulation follows the composition of the book stock; that is, reading is controlled or strongly conditioned by ac- cessibility. But perhaps the librarian was fitting the holdings (through book selection) to the expressed or implied prefer- ences of the active clientele. The greater circulation of fic- tion by smaller libraries probably also corresponds to the greater holdings of fiction by such libraries, but this condition is also subject to the same problem of interpretation. In any case, the relationship between circulation and holdings is obviously relevant in any description of the kinds of books the library distributes. The big problem here is to determine how the public library can affect popular reading through its policy of book acquisition. *Wight and Carnovsky, 1936. ““Scott, 1943. In the same study, the distribution of holdings and circulation by certain classes of fiction reveals the kinds of novels preferred by the clientele. Plot Love Character Social Other Holdings 36 23 28 12 I Circulation 45 26 16 8 5 Thus, the library patrons “overuse” plot and love fiction and “underuse” character and social problem novels. "Ellsworth, 1937.