One of the most common and most inconsiderate questions propounded to a librarian is this: "Do you ever expect to read all these books through?" and it is well answered by propounding another question, namely--"Did _you_ ever read your dictionary through?" A great library is the scholar's dictionary--not to be read through, but to enable him to put his finger on the fact he wants, just when it is wanted. A knowledge of some at least of the foreign languages is indispensable to the skilled librarian. In fact, any one aspiring to become an assistant in any large library, or the head of any small one, should first acquire at least an elementary knowledge of French and Latin. Aside from books in other languages than English which necessarily form part of every considerable library, there are innumerable quotations or words in foreign tongues scattered through books and periodicals in English, which a librarian, appealed to by readers who are not scholars, would be mortified if found unable to interpret them. The librarian who does not understand several languages will be continually at a loss in his daily work. A great many important catalogues, and bibliographies, essential parts of the equipment of a library, will be lost to him as aids, and he can neither select foreign books intelligently nor catalogue them properly. If he depends upon the aid of others more expert, his position will be far from agreeable or satisfactory. How many and what foreign languages should be learned may be matter for wide difference of opinion. But so far-reaching is the prevalence of the Latin, as one of the principal sources of our own language, and of other modern tongues, that a knowledge of it is most important. And so rich is the literature of France, to say nothing of the vast number of French words constantly found in current English and American books and periodicals, that at least a fairly thorough mastery of that language should be acquired. The same may be said of the German, which is even more important in some parts of the United States, and which has a literature most copious and valuable in every varied department of knowledge. With these three tongues once familiar, the Italian, Spanish, Portuguese, Dutch, and Scandinavian languages may be, through the aid of dictionaries, so far utilized as to enable one to read titles and catalogue books in any of them, although a knowledge of all, so as to be able to read books in them, is highly desirable.