324 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



The work of the libraries of the Bureau of Entomology, Bureau 

 of Markets, Bureau of Plant Industry, and Dairy Division in revis- 

 ing* the bibliographical lists accompanying the publications of their 

 respective bureaus has been continued. 



The Bureau of Chemistry prepared a list of references to periodi- 

 cal articles, and also to patents, which have appeared since July 1, 

 1914, on products of commercial value, produced by microorganisms. 



The Forest Service library prepared in August, 1917, an extensive 

 bibliography on Reforestation covering 90 typewritten pages. Two 

 other special bibliographies prepared in that library were printed 

 during the year, one on Forest Taxation by the extension service of 

 the New Hampshire College of Agriculture and the Mechanic Arts, 

 and a short supplementary " Government Paper Bibliography," by 

 " Paper." The list of books and articles indexed by the Forest Serv- 

 ice library is still printed each month in American Forestry. 



In the Bureau of Markets library the " Selected List of Publica- 

 tions on the Marketing of Farm Products " compiled in 1915 was re- 

 vised to April 1, 1918. It covers approximately 80 pages and has 

 been issued in mimeographed form. 



In the Bureau of Plant Industry library the current literature on 

 Phytopathology has been indexed and j)ublished currently in 

 " Phytopathology." 



In the Office of Farm Management library annotated lists have 

 been prepared on the cost of production of various crops. 



In the States Relations Service library the manuscript revision 

 of the " List of Publications of the State Experiment Stations " has 

 been brought through 1917. In addition, a subject index on cards 

 to extension publications of the various State agricultural colleges 

 issued since December, 1915, has been prepared and is kept up to date. 

 Typewritten lists of these publications have been prepared for the 

 States in alphabetical order up to and including Nebraska. Begin- 

 ning with January, 1918, a monthly list of current extension publica- 

 tions has been issued in mimeographed form. 



PERIODICALS AND OTHER SERIALS. 



Miss Lydia K. Wilkins, Chief, Periodical Division. 



The total number of different periodicals, exclusive of annuals 

 and serials of infrequent issue, received currently during the year 

 was 2,433, of which 589 were received by purchase and 1,844 by 

 gift. The number of new periodicals added during the year was 

 289 whereas 75 of those on last year's list are no longer received, 

 either because they have ceased publication permanently or tempo- 

 rarily or because the subscriptions for them have been discontinued. 

 The net increase for the year was 214. In order to meet the demands 

 for certain periodicals it was necessary to purchase 181 duplicates, 

 making the total number of periodicals purchased 770, a net increase 

 of 19 over the previous year. The Library also received a number 

 of duplicates by gift and exchange, making the total number of 

 periodicals handled currently daring the year 3,428, a net increase of 

 179 for the year. 



