One of the important duties of such an assistant, regardless of whether the agricultural collections are maintained as a separate library or incorporated with the general library, should be the care and collection of agricultural publications obtainable by gift or exchange. There is now a great accumulation of public and miscellaneous documents, American and foreign, which may be obtained at little or no expense as regards purchase, but the collection, safeguarding and general care of this material is a very considerable task. Too many of the agricultural colleges and experiment stations have not sufficiently regarded the importance of collecting this material and of keeping their files complete and in a readily available form. A large portion of this material is never noted in the bibliographies of the book trade. It must be sought for in catalogs and book lists, in reviews, second-hand catalogs, and in many less obvious places. Much of the material is not for sale and is only obtainable by gift or exchange. It is therefore an important matter that there should be close co-operation between the experiment station and the library in arranging such exchanges. The station bulletins and reports, published by each state, should be the means of obtaining for the station or college library many valuable exchanges from this country and abroad. In regard to the accessions to the library, whether obtained by purchase or gift, there are certain definite principles which should be followed: first, it is most desirable that all the purchases of books and periodicals for all the collections included in the university and experiment station should be made by the central general library, even the books purchased from the Adams fund, in connection with some definite project; second that all the records in regard to the resources of the library be kept in the general library. Furthermore, all the collections, whether obtained by gift or purchase, should be regarded as the unquestioned property of the institution at large, and under the custody of the librarian.