Of course much of this extension work is altogether outside of the sphere of the library, but there are signs that the libraries of agricultural colleges, and of the land grant colleges especially are waking up to the fact that there are public needs which they are best fitted to supply. The extension departments of the various colleges have found a number of problems confronting them in which they need the help of the college library, such for instance as matters relating to the use of books for special study, and the general problem of awakening in the farm community an interest in books and reading. I shall attempt briefly to characterize the various phases which this library extension work has taken, or may take, without more than passing reference to the work of specific institutions. The first letter of enquiry sent by a farmer to his state college or experiment station, might be said to have originated the entire extension work, and the growth of correspondence between farmers and the college, with its professors and experts, indicates the nature of the demand on the part of the public, and the success of the work of the stations and colleges in arousing this interest. This correspondence forms and always will form a very important phase of university extension work. To get in touch with individuals, to have them take the trouble to write you concerning their needs is a sure indication of their interest. Just as the correspondence of the commercial house is systematized, and form letters used where possible, so the growth of this extension work has led to the publication of brief bulletins, or circulars in place of the elaborate and lengthy bulletins so often issued by the experiment stations on the same subjects. One of the needs which was soon felt in correspondence was that for a brief list of books on agriculture, which could be sent in response to inquiries from individuals and libraries. This list is sometimes a simple mimeographed list, or a short printed list, or even a more elaborate bulletin, such as the Cornell publication, "What shall the farmer read" or the more recent one, "Reading in the farm home." There is real need for these lists, and every college library or extension department should have such a list available for distribution. There is room perhaps for some co-operation here in order to secure greater uniformity and the opinions of many who are in close touch with the needs of the farming community.