Numerous as are the views which have been expressed upon the proper scope and quality of the library of the future, we propose to add one to the list of suggestions. It is that the next founder of a library should confine it entirely to _periodicals_. It is through current literature that every kind of science and every tendency of thought now finds expression. The profoundest discussions in philosophy, discoveries in knowledge, keenest studies of life and character, are now made through the world's weekly and monthly publications. Books are often no more than summaries of what has been printed before in separate magazines. We have in fact heard of one gentleman who broke up the library he had spent years in collecting, and gave his attention to periodicals, because they were the original sources of knowledge in his profession. The libraries which we have styled "professional" are compelled to spend large sums on these issues, which were once styled "ephemeral," but are now found to be of lasting value. Under these circumstances, why not have a library of this periodical literature? Just as some men refuse to read translations, learning a new language if a book they need is printed in a tongue unknown to them, so let us reject summaries and accumulate original materials. As to the cost of such a library, the five thousand important periodicals which are said to be published will require probably $30,000 a year for their purchase, and if as much more is added for rent, binding, salaries, etc., we have an income required which demands a capital of more than a million dollars, to say nothing of half a million for back numbers! Some readers may be curious to know what chance there is of making a collection that shall be fairly representative of the world's literature. We can safely answer, _none_. Herr Hottinger, who has issued the prospectus of a universal catalogue of all books published, thinks there are about three million titles, and his critics say this estimate is too low. Twenty-five thousand new works are said to be added each year to this number. Now the largest number of _volumes_ (and therefore a less number of titles) added to libraries in this country yearly, is: Boston Public Library, 18,000; Philadelphia Mercantile, 17,004; Congressional, 15,400; Chicago Public, 11,331; Cincinnati Public, 11,398; New York Mercantile, 8,000; and Harvard, 7,000. The numbers reported by the Mercantile and public libraries are of little value, since these institutions often buy a dozen or a score copies of a popular work. It is therefore evident that no library in this country is even attempting to keep up with the current issue of books.