In some of our universities one or more of the departments are several miles away from the main body of the institution. It is obviously necessary that the books most used in those departments should be near enough so that the students can have access to them without too much inconvenience and loss of time. In the ordinary institution, however, most of the buildings are grouped in a comparatively small area, and it is seldom more than five minutes' walk from the most remote building to the library. In a condition such as this, and with the exceptions noted above, I am inclined to the opinion that the university is best served by a central library containing the main collection, and small, rigidly selected laboratory libraries comprising books which from their very nature are most useful in the laboratory as manuals of work. The arguments generally advanced in favor of the system are these: 1. The instructor needs to be able to refer, at a moment's notice, to any book relating to his subject. 2. The system enables the instructor to keep a more careful watch over the reading of his students. 3. The best interests of the library demand that each division of the library shall be directly under the eye of the men most interested in it, that is to say, the instructors in the various departments; that they should direct its growth and watch over its interests. That the first and second of these arguments have great weight cannot be denied, but with a properly constructed library building and most careful administration the requirements of both instructor and student can be met quite as well by a central system. It is, of course, quite impossible for each instructor to have in his office all the books necessary for his work. The duplication necessary for this purpose would be impracticable even for the most wealthy university. He must, therefore, go from his office or class room to the department library and search for the book himself. With the confusion which generally reigns in a library of this sort, and with the lack of effective registration of loans, this is quite often a matter of some difficulty.