I! KPORT OF THE SECRETARY. 



107 



Volumes catalogued 



Volumes roeataloguod 



Library of Congress cards tiled 



Catalogue cards typed 



New titles added to author catalogue 



1<J21 



1920 



Large as the amount of cataloguing has been, however, in com- 

 parison with last year, it has not been sufficient to meet the demands 

 occasioned by the receipts; and many of the reprints and theses 

 remain uncatalogued. 



Periodicals. — The number of entries at the periodical desk was 

 14,008, Nine hundred and forty-five volumes were completed. 



Exchanges. — The securing of publications in exchange for the 

 completion of sets in the Library of Congress has been continued, 

 with the following results: 



Number of want cards received from — 



Smithsonian division l 201 



Periodical division 90 



Order division -IS 



Total 420 



Number of publications secured for — Vols. Parts. 



Smithsonian division 290 255 



Periodical division 19 201 



Order division 5 3 



Total 324 459 



OFFICE LIBRARY. 



Accessions to the office library, including the aeronautical collec- 

 tion, the collection of Bonaparteana, the art room collection, and 

 the employees' library, numbered 317 volumes, 4 parts of volumes, 

 and 468 pamphlets. This does not include many periodicals, of 

 which the current numbers are kept on file in the reading room, and 

 the completed volumes transmitted at the end of the year to the 

 Library of Congress. The library is greatly indebted to Dr. Frank 

 Wigglesworth Clarke for the presentation of his unique collection of 

 authors' reprints on the determination of the atomic weights, num- 

 bering 482 titles. 



Circulation. — The total circulation of the Library was 3,485, con- 

 sisting of 2,708 magazines borrowed from the reading room, 500 

 books from the employees' library, and 171 from the reference room. 

 Main' volumes which are not permitted to leave the building wore 



