REPORT OF THE SECRETARY. 109 



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 291 



Periodical division , 90 



Order division 48 



Total 429 



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 Buonaparteana, 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 48*2 titles. 



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

 sisting of 2,708 magazines borrowed from the reading room, 506 

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

 Many volumes which are not permitted to leave the building were 

 consulted, especially reference works and the books of the aero- 

 nautical collection and the De Peyster collection. 



Bibliography. — The second volume of the Bibliography of Aero- 

 nautics, prepared by the assistant librarian, covering the period from 

 1909 to 1916, was completed and published by the National Advisory 

 Committee for Aeronautics. This volume contains approximately 

 35,000 citations and cross references, and supplements the material 

 contained in the volume published by the Smithsonian Institution 

 as volume 55 of the Smithsonian Miscellaneous Collections. The 



