It was the well-nigh unanimous report at a Conference of American librarians, upon the subject of "aids to readers", that "nothing can take the place of an intelligent and obliging assistant at the desk." This was after a thorough canvass of the relative merits of the various reference books and helps to readers in book form. Not only the casual reader, and the reader with a purpose may be constantly aided by the librarian's knowledge, and larger experience in the art of finding things, but teachers in the schools, clergymen preparing discourses, and every one seeking to know anything, should find the librarian a living catalogue. There is nothing so effective in the world as individual effort. CHAPTER 11. ACCESS TO LIBRARY SHELVES. The matter of free or unrestricted access to the books on the shelves is a vexed question in libraries. Open and unprotected shelves, either in alcoves or the main reading room, while they appear to be a boon to readers, who can thus browse at will through the literary pastures, and turn over volumes at their pleasure, furnish by no means good security for the books. Some of the smaller public libraries protect their books from access by glass doors in front of the shelves, which form also a partial protection against dust. Others again, use wire screen doors, opened, like the others, by lock and key when books are wanted. Both of these arrangements give to readers the advantage of reading the titles on the backs of most of the books in the library, while protecting them from being handled, disarranged, or removed. But they are also open to the objection that they obstruct the prompt service of the books, by just the amount of time it takes to open the doors or screens, and close them again. This trouble and delay may overbalance the supposed advantages. Certainly they must do so in all large libraries, where the frequentation is great, and where every moment's delay in the book service works disadvantage to numerous readers. While private libraries, or quite small public ones, can indulge in the luxury of glass cases, no extensive collection can be managed with the requisite promptitude under their obstructions. But how to avoid the indiscriminate and usually careless handling of the books on shelves, by the people frequenting the library, and still extend to readers prompt and full service of all the books they wish to consult on any subject, is a problem. In a few of the great libraries, where that modern improvement, the stack system, prevails, the difficulty is solved by the storing of the books in the outside repositories, or iron book-stacks to which readers are not admitted. In this case the reading room is only for books in use by those frequenting it, or is supplied with a selection of reference books simply, the stacks being drawn upon for all the rest. This of course secures the books both from misplacement and from pillage.