Are my metaphors too violent? I think not. We are dealing here with imponderables, as I have said, but the most imponderable thing of all, and the most potent, is the human mind. To wield, concentrate, and control our battery of energies we want a correlated energy--one whose relations to them all are close and one who knows how to pull all the throttles, turn all the valves, and operate all the mechanism that brings them into play. It takes two years of hard work, nowadays, for a college graduate to get through a library school, and it should not be necessary to argue that during these two years he is working hard on essentials and is assimilating material that the untrained man however able, cannot possibly acquire in a few month’s casual association with a library or from mere association with books, no matter how long or how intimate. You will pardon me, I am sure, some further quotation from Mr. Hicks’s illuminating article. After calling our attention to the fact that the effort to meet changing conditions in instruction is purely technical, he goes on: The librarian stands in the position of an engineer to whom is presented a task which by the methods of his profession he must perform. Numerical growth, expansion, addition of new schools and new subjects, and the introduction of the laboratory method by which books are made actual tools for use, all mean to the librarian more books, larger reading-rooms and more of them, a large staff specialized and grouped into departments, the supervision of a complicated system, and capable business administration. These are all technical matters and are of sufficient magnitude to require all of the time and strength of those to whom they are entrusted.... In a reference library, open shelves, whether in department libraries or in the general library, require much high-grade library service. The reference librarian becomes a direct teacher in the use of books and gives constant assistance not merely in finding separate books but in dealing with the whole literature of a subject.... The whole development from the few-book method to the many-book method presupposes a system of reserve books. By this expression is meant the placing of a collection of books behind an enclosure of some kind from which they are given out by a library assistant for use in the room. The reserve collections, continually changing in accordance with the directions of instructors, are in reality composite textbooks....