It is evident from what was said above about portable houses, that difference of locality is apt to introduce important exceptions into any rule of this kind; and it is on these exceptions that we are to dwell particularly to-day. There are thousands of particulars in which it is desirable that a library in one town should be conducted exactly like one in another town. What are the particulars in which the library must or should be different? First, let us consider the stock of books. If these have been selected properly, differences between the two towns will perhaps be first reflected in these, for a library’s ability to serve its community depends primarily on certain correspondences between the books and the readers. These correspondences may be summarized by saying that the books in a library must represent a combination of the readers’ wants and their needs. These might always coincide in an ideal community, but in practice no librarian thinks of paying attention to the one to the exclusion of the other. At the same time the demands of the readers should always be known and always considered even if they want what is unnecessary; and we must likewise try to ascertain what they need, even if they have no desire for it. The extremes in a community without library taste would be a library of trashy fiction and one of serious standard works at which no one ever looked. A book-selector who uses good judgment will of course steer between this Scylla and this Charybdis, and the result will be a collection that the community can use with both pleasure and profit. Moreover, as time goes on, the readers’ taste and the quality of their library will both slowly but surely rise. No two towns are alike. Where the books have been thus selected, the collections will reflect the character of the communities, not only in literary taste but in many other things. The industries of the towns are likely to differ. In one, perhaps, there are potteries; in the other, shoe factories. The workers in the industries and even outsiders interested in them for local reasons, should have an opportunity to consult their literature. The natural resources of the regions doubtless differ--their crops, their mineral output, their attractiveness to the summer tourist. Transportation facilities vary. All these things have their reflection in books and the differences of the towns have their corresponding reflections in their libraries.