This group might be sub-divided into scientific, medical, theological, law, and special or business; each requiring individual treatment and the advice of a librarian of mature experience in just that specialty. Here again the library will often be housed only in a room or a suite of rooms, to which should be assigned the best possible situation in the building, bearing in mind quiet, light and easy access. The users will be so select and responsible that they can be allowed full access to the shelves. Their use will be like that of professors or graduate students in a university. Wall shelving around rooms in which there are tables for readers; or where many books have to be assembled in one room, shallow alcoves and wall shelving opposite good light with tables near the windows; would be suitable arrangements for such rooms, with a minimum of service and supervision, and of florid ornamentation. Where a separate building is possible, other features might be added. Then, of course, general considerations would apply as to storage of books, administration and accommodation of readers.

Scientific. These would probably be libraries of separate or affiliated societies, in a building with club features; really specialized club libraries, for members only. They would be reference libraries almost entirely, without much circulation. Alcoves and wall shelving would be appropriate, with tables and racks for professional periodicals, and facilities for writing, without much probability of a great rush at any one time.

Medical. These would have much the same use as scientific, much the same quarters, much the same treatment. They would generally be larger, often with separate buildings. Special thought would have to be given to periodicals, the current numbers and back sets of which form a large proportion of the literature of this profession.

There were only thirty medical libraries listed in the government report of 1876, and very few of these appeared to have separate buildings. It would seem appropriate, in this class, to have a museum in the same building as the library, to illustrate the professional literature graphically.

Theological. The majority of such libraries would be attached to schools or colleges and partake of the treatment of departments in universities. There are a few large general theological libraries, however, with separate buildings. Quiet study, open access, slight supervision, inexpensive service, are their requisites. In theological schools it may be desirable to have class rooms near the library.

Separate rooms for quiet reading and writing would always be a convenience, if funds allow.

Where much attention is paid to the older literature of theology, a special provision of shelves for folios and quartos would be required.

Special and Business. As these libraries have recently formed a separate society or section of the American Library Association, they evidently have unique subjects to discuss, but few of them have attained the dignity of separate buildings.

They generally have to content themselves with a suite of rooms. Each one has its individual character, and can be ranked perhaps in the scientific and professional classes, except that any one library will probably have a more restricted group of readers, consisting of the partners and employees of the maintaining firm or establishment.