room on the right contains the
Science Division (No. 225). There are about 35,000 books under the
control of this Division.

=Economics Division.= From the corridor on the northern or 42nd Street end
of the building open the rooms devoted to Public Documents (No. 229) and
Economics and Sociology. These were formerly separate divisions, but now
united, and the entrance is through Room 229. The resources of the
Division (including the large collection of Public Documents) number
about 400,000 books and pamphlets.

=Business Offices.= The rooms opening from the corridor running south from
the main staircase are mostly business offices, devoted to the
administration of the Library. They are of little interest to
sightseers, but are open to any persons who have occasion to visit them.
They include, on the front of the building, a lecture room (No. 213),
the office of the Director of the Library (No. 210), and the meeting
room of the Board of Trustees (No. 205). On the inner or western side of
the corridor are: a study (No. 214), the office of the Editor of
Publications (No. 212), and of the Reference Librarian (No. 211). The
Trustees' Room may be seen on special application at the Director's
office. Over the mantelpiece in this room is the inscription:

THE CITY OF NEW YORK HAS ERECTED THIS
BUILDING FOR THE FREE USE OF ALL THE PEOPLE
MCMX
I LOOK TO THE DIFFUSION OF LIGHT AND EDUCATION
AS THE RESOURCE MOST TO BE RELIED ON FOR
AMELIORATING THE CONDITION PROMOTING THE VIRTUE
AND ADVANCING THE HAPPINESS OF MAN

THOMAS JEFFERSON

[Illustration: MALL BEHIND LIBRARY]

On the corridor leading west, and running along the 40th Street end of
the building, are workrooms, open only to visitors having business
engagements. These rooms are the office of the Order Division (No. 204)
and of the Cataloguing and Accessions Divisions (No. 200 and No. 201).

[Illustration: SOUTH COURT]

THIRD FLOOR

The most important room on the third floor and, indeed, the centre of
activity of the entire Reference Department of the Library, is the Main
Reading Room, approached through the Public Catalogue Room. The latter
opens from the western side of the corridor at the head of the
staircases.

=Public Catalogue Room.= This room (No. 315) contains the catalogue of the
books in the Reference Department of the Library,--that is, the books
available to readers in the Main Reading Room and in the special reading
rooms