It is true of the great majority of readers resorting to a library, that they have a most imperfect idea, both of what they want, and of the proper way to find it. The world of knowledge, they know, is vast, and they are quite bewildered by the many paths that lead to some part or other of it, crossing each other in all directions. And among the would-be readers may be found every shade of intelligence, and every degree of ignorance. There is the timid variety, too modest or diffident to ask for any help at all, and so feeling about among the catalogues or other reference-books in a baffled search for information. There is the sciolist variety, who knows it all, or imagines that he does, and who asks for proof of impossible facts, with an assurance born of the profoundest ignorance. Then, too, there is the half-informed reader, who is in search of a book he once read, but has clean forgotten, which had a remarkable description of a tornado in the West, or a storm and ship-wreck at sea, or a wonderful tropical garden, or a thrilling escape from prison, or a descent into the bowels of the earth, or a tremendous snow-storm, or a swarming flight of migratory birds, or a mausoleum of departed kings, or a haunted chamber hung with tapestry, or the fatal caving-in of a coal-mine, or a widely destructive flood, or a hair-breadth escape from cannibals, or a race for life, pursued by wolves, or a wondrous sub-marine grotto, or a terrible forest fire, or any one of a hundred scenes or descriptions, all of which the librarian is presumed, not only to have read, but to have retained in his memory the author, the title, and the very chapter of the book which contained it. To give some idea of the extent and variety of information which a librarian is supposed to possess, I have been asked, almost at the same time, to refer a reader to the origin of Candlemas day, to define the Pragmatic Sanction, to give, out of hand, the aggregate wealth of Great Britain, compared with that of half-a-dozen other nations, to define the limits of neutrality or belligerent rights, to explain what is meant by the Gresham law, to tell what ship has made the quickest voyage to Europe, when she made it, and what the time was, to elucidate the meaning of the Carolina doctrine, to explain the character and objects of the Knights of the Golden Circle, to tell how large are the endowments of the British Universities, to give the origin of the custom of egg-rolling, to tell the meaning of the cipher dispatches, to explain who was "Extra Billy Smith," to tell the aggregate number killed on all sides during the Napoleonic wars, to certify who wrote the "Vestiges of Creation," or, finally, to give the author of one of those innumerable ancient proverbs, which float about the world without a father.