64 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



Copies. 

 National Weather and Crop Bulletin (weekly from April to September, 



monthly from October to March) 3,750 



Snow and Ice Bulletin (weekly during the winter) 1,110 



Forecast cards (daily, except Sundays and holidays) 1, 550 



Weekly forecasts 240 



Monthly Meteorological Summary for Washington, D. C 250 



The distribution of periodical publications to foreign countries 

 through the international exchange service and by mail was as 

 follows : 



Addresses. 



Washington Weather Map 83 



Monthly Weather Review 376 



Monthly Climatological Data 71 



National Weather and Crop Bulletin 30 



Snow and Ice Bulletin 7 



Annual Report of Chief of Bureau 43 



The number of paid subscriptions on our mailing lists at the close 

 of the year was as follows: 



Subscribers. 



Washington Weather Map 56 



National Weather and Crop Bulletin 491 



Snow and Ice Bulletin 49 



Climatological Data 7 



Subscriptions for the Monthly Weather Eeview are filled by the 

 superintendent of documents from the 75 copies furnished him each 

 month by this division . 



Remittances received by the superintendent of documents cover- 

 ing subscriptions for Weather Bureau publications were as follows: 



Washington Weather Map $152. 15 



National Weather and Crop Bulletin 118. 25 



Snow and lee Bulletin 12. 25 



Climatological Data 48. 30 



Station Weather Maps 217.61 



Total 54S.56 



LIBRARY. 



During the year 775 books and pamphlets were added to the 

 library, while about 275 were eliminated, by transfer to the Library 

 of Congress or otherwise. The total strength of the collection is 

 now approximately 35,500 volumes. Apart from reference books 

 and files of scientific journals, the books in the library relate almost 

 exclusively to meteorological, climatological, aeronautical, and seis- 

 mologicarsubjects, including an immense amount of statistical liter- 

 ature, and the collection is quite unique among American libraries. 

 Special efforts were made during the year to bring up arrears of 

 binding. The total of 2,208 volumes sent to the binder was much 

 greater than in any previous year. 



AEROLOGICAL INVESTIGATIONS. 



The installation of the Drexel Aerological Station was com- 

 pleted, and free observations by means of kites were begun in Octo- 

 ber, 1915. 



