As a basis on which cooperation of these and other kinds is to rest there must be personal acquaintance and confidence between the clergy and the librarian. This is something of which increase will bring further increase, as in the accretions to a rolling snowball. For instance, the pastor of a church must have a certain degree of confidence in the librarian’s good-will and ability to venture to recommend the purchase of a book; the librarian must have the same to be willing to entertain and act upon such a recommendation. But the contact once made, the book once bought, there is ground for increased confidence and acquaintance and for additional advice, and so it goes. It will be noted that this counsel lays a greater burden on the librarian than on the clergy. It is no great task for any clergyman to make the acquaintance of the librarian; it is quite another thing for the librarian to do the same by each and every clergyman in his city. If the city is large and the clergy of various denominations are numbered by thousands, it is practically impossible. Recognizing this fact, the clergy should take some steps toward making collective take the place of individual acquaintance. They should invite the librarian to their meetings and he on his part should be ready to attend and to address them if requested to do so. It should hardly be necessary to warn both parties to such cooperation as this, that the obtrusion of considerations of personal advantage, where this conflicts with public service, will be fatal to its success. For instance, a clergyman who is preparing an address on some rather unusual subject must not expect the librarian of a small city to expend public money for books which will aid him, and him alone, in his work. Fortunately, this particular issue can generally be avoided, owing to the growth of facilities for inter-library loans. Altho the librarian might properly refuse to buy these particular books, he would doubtless offer to attempt to borrow them from some larger library, and this attempt would have a good chance of success. Interlibrary service of this kind is bound to increase largely in the future and offers a most promising field for the rendering of aid by the smaller libraries to the scholar, literary worker, and investigator, including, of course, the clergyman.