The general policy of the faculty of the college of agriculture (or the staff of the experiment station) as to purchase of books out of these two different funds for college and experiment station is to buy books for special investigations out of station funds unless they clearly would be of use also to the students and instructors of the college at large. Books needed by the special investigator and the college in general at the same time are duplicated. When books are no longer needed in the laboratory or office for the special work for which they were bought, they are returned for general circulation to the main library by whose staff they were ordered and cataloged. Books already in the library, whether bought out of library funds or equipment funds for any college may be sent to a laboratory, office, or reading room from the main library unless they are needed for reference or class use in the main library or any branch of it. Exchange. The library and experiment station also work together in the matter of exchanges. The library exchange assistant arranges for the exchange of experiment station publications the same as for other publications of the university, while the station attends to the actual mailing of its publications, as it has better facilities for this than the library. In this way the library receives from the exchange of the agricultural experiment station publications alone between four and five hundred publications, of which more than one-half are from foreign countries, seventy agricultural periodicals and the publications of ninety learned societies being obtained in addition to the publications of state universities and stations and universities and libraries all over the world. Besides these, the library receives by the exchange of other University of Illinois publications many hundred more publications, some of which are of interest to agricultural scientists and economists. =Advantages of the Consolidation of Station and University Libraries= 1. Economy of administration. No staff of agriculturists or any other specialists trained for scientific or literary research can be expected to order, catalog and care for books as quickly and efficiently as can the well organized library staff of forty, with its order department, gifts, exchange and periodical assistants, and cataloging, binding, loan, and reference departments, whose whole time and attention is devoted to these special lines of library work. The library, too, which handles some thirty thousand new books a year can afford to have more elaborate equipment in the way of trade bibliographies of various countries, catalogs of other libraries, mechanical means for duplicating catalog cards, shelving books, etc., than can such an institution as an experiment station whose money should be spent mostly on salaries of specialists and laboratory and field equipment. 2. Security in preservation of valuable books.